diff --git a/web/includes/actions/montage.php b/web/includes/actions/montage.php
index c4b55b2af..18ebb2b68 100644
--- a/web/includes/actions/montage.php
+++ b/web/includes/actions/montage.php
@@ -21,9 +21,9 @@ require_once('includes/MontageLayout.php');
 
 if ( isset($_REQUEST['object']) ) {
   if ( $_REQUEST['object'] == 'MontageLayout' ) {
-    if ($action == 'Save') {
-      $Layout = null;
+    $Layout = null;
 
+    if ($action == 'Save') {
       # Name is only populated when creating a new layout
       if ( $_REQUEST['Name'] != '' ) {
         $Layout = new ZM\MontageLayout();
@@ -44,7 +44,35 @@ if ( isset($_REQUEST['object']) ) {
         ZM\Warning('Need System permissions to edit layouts');
         return;
       } 
-    } // end if save
+    } else if ($action == 'Delete') { // end if save
+      if ( isset($_REQUEST['zmMontageLayout']) ) {
+        $Layout = new ZM\MontageLayout($_REQUEST['zmMontageLayout']);
+      } else {
+        ZM\Warning('Name of layout to be deleted is not specified');
+        return;
+      }
+
+      if (canEdit('System')) {
+        if ($Layout->Id()) {
+          $Layout->delete();
+          zm_session_start();
+          unset($_SESSION["zmMontageLayout"]);
+          $_SESSION['zmMontageLayout'] = '';
+          session_write_close();
+          unset($_COOKIE['zmMontageLayout']);
+          zm_setcookie('zmMontageLayout', '', array('expires'=>time()-3600*24)); //!!! After this JS still sees cookies, strange !!!
+          $redirect = '?view=montage';
+        } else {
+          ZM\Warning('Layout Id=' . $_REQUEST['zmMontageLayout'] . ' not found for delete');
+          $redirect = '?view=montage';
+        }
+      } else {
+        ZM\Warning('Need System permissions to delete layouts');
+        $redirect = '?view=montage';
+      } 
+    } else {// end if delete
+      ZM\Warning("Unsupported action $action in montage");
+    } // end if else
   } # end if isset($_REQUEST['object'] )
 } # end if isset($_REQUEST['object'] )
 ?>
diff --git a/web/lang/en_gb.php b/web/lang/en_gb.php
index 3a7b07343..9f15884f3 100644
--- a/web/lang/en_gb.php
+++ b/web/lang/en_gb.php
@@ -220,6 +220,7 @@ $SLANG = array(
     'ConfirmDeleteControl'  => 'Warning, deleting a control will reset all monitors that use it to be uncontrollable.<br><br>Are you sure you wish to delete?',
     'ConfirmDeleteDevices'  => 'Are you sure you wish to delete the selected devices?',
     'ConfirmDeleteEvents'   => 'Are you sure you wish to delete the selected events?',
+    'ConfirmDeleteLayout'   => 'Are you sure you wish to delete current layout?',
     'ConfirmDeleteTitle'    => 'Delete Confirmation',
     'ConfirmPassword'       => 'Confirm Password',
     'ConfirmUnarchiveEvents'=> 'Are you sure you wish to unarchive the selected events?',
diff --git a/web/lang/fr_fr.php b/web/lang/fr_fr.php
index a5a0453b4..2966b787f 100644
--- a/web/lang/fr_fr.php
+++ b/web/lang/fr_fr.php
@@ -226,6 +226,7 @@ $SLANG = array(
     'Config'               => 'Config',
     'ConfiguredFor'        => 'Configuré pour',
     'ConfirmDeleteEvents'  => 'Etes-vous sûr de vouloir effacer le(s) événement(s) sélectionné(s)?',
+    'ConfirmDeleteLayout'  => 'Êtes-vous sûr de vouloir supprimer la mise en page actuelle ?',
     'ConfirmPassword'      => 'Répéter mot de passe',
     'ConjAnd'              => 'et',
     'ConjOr'               => 'ou',
diff --git a/web/lang/ru_ru.php b/web/lang/ru_ru.php
index 55d2b4264..a922f91ba 100644
--- a/web/lang/ru_ru.php
+++ b/web/lang/ru_ru.php
@@ -246,6 +246,7 @@ $SLANG = array(
     'Config'               => 'Конфигурация',
     'ConfiguredFor'        => 'настроен на',
     'ConfirmDeleteEvents'  => 'Вы действительно хотите удалить выбранные события?',
+    'ConfirmDeleteLayout'  => 'Вы действительно хотите удалить текущий шаблон?',
     'ConfirmPassword'      => 'Подтвердите пароль',
     'ConfirmUnarchiveEvents'=> 'Вы уверены, что хотите удалить из архива выбранные события?',
     'ConjAnd'              => 'и',
diff --git a/web/skins/classic/views/js/montage.js b/web/skins/classic/views/js/montage.js
index c587db670..95103f8c8 100644
--- a/web/skins/classic/views/js/montage.js
+++ b/web/skins/classic/views/js/montage.js
@@ -53,7 +53,7 @@ function stringToNumber(str) {
 }
 
 function isPresetLayout(name) {
-  return (( name=='Freeform' || name=='1 Wide' || name=='2 Wide' || name=='3 Wide' || name=='4 Wide' || name=='6 Wide' || name=='8 Wide' || name=='12 Wide' || name=='16 Wide' ) ? true : false);
+  return ((ZM_PRESET_LAYOUT_NAMES.indexOf(name) != -1) ? true : false);
 }
 
 function getCurrentNameLayout() {
@@ -137,6 +137,7 @@ function selectLayout(new_layout_id) {
   }
 
   if (isPresetLayout(nameLayout)) { //PRESET
+    document.getElementById("btnDeleteLayout").setAttribute('disabled', '');
     setSelected(document.getElementById("ratio"), getCookie('zmMontageRatioForAll'));
     changeRatioForAll();
 
@@ -158,6 +159,7 @@ function selectLayout(new_layout_id) {
     }
     initGridStack();
   } else { //CUSTOM
+    document.getElementById("btnDeleteLayout").removeAttribute('disabled');
     for (let i = 0, length = monitors.length; i < length; i++) {
       const monitor = monitors[i];
       // Need to clear the current positioning, and apply the new
@@ -409,6 +411,7 @@ function save_layout(button) {
     Positions['monitorRatio'][stringToNumber(this.id)] = getSelected(this);
   });
   form.Positions.value = JSON.stringify(Positions, null, '  ');
+  $j('#action').attr('value', 'Save');
   form.submit();
 } // end function save_layout
 
@@ -436,6 +439,53 @@ function cancel_layout(button) {
   selectLayout();
 }
 
+function delete_layout(button) {
+  if (!canEdit.System) {
+    enoperm();
+    return;
+  }
+  if (!document.getElementById('deleteConfirm')) {
+    // Load the delete confirmation modal into the DOM
+//    $j.getJSON(thisUrl + '?request=modal&modal=delconfirm')
+    $j.getJSON(thisUrl + '?request=modal&modal=delconfirm', {
+      key: 'ConfirmDeleteLayout',
+    })
+        .done(function(data) {
+          insertModalHtml('deleteConfirm', data.html);
+          manageDelConfirmModalBtns();
+          $j('#deleteConfirm').modal('show');
+        })
+        .fail(function(jqXHR) {
+          console.log('error getting delconfirm', jqXHR);
+          logAjaxFail(jqXHR);
+        });
+    return;
+  } else {
+    $j('#deleteConfirm').modal('show');
+  }
+} // end function delete_layout
+
+// Manage the DELETE CONFIRMATION modal button
+function manageDelConfirmModalBtns() {
+  document.getElementById('delConfirmBtn').addEventListener('click', function onDelConfirmClick(evt) {
+    document.getElementById('delConfirmBtn').disabled = true; // prevent double click
+    if (!canEdit.Monitors) {
+      enoperm();
+      return;
+    }
+    evt.preventDefault();
+
+    const form = $j('#btnDeleteLayout')[0].form;
+    $j('#action').attr('value', 'Delete');
+    form.submit();
+  });
+
+  // Manage the CANCEL modal button
+  document.getElementById('delCancelBtn').addEventListener('click', function onDelCancelClick(evt) {
+    $j('#deleteConfirm').modal('hide');
+  });
+}
+
 function reloadWebSite(ndx) {
   document.getElementById('imageFeed'+ndx).innerHTML = document.getElementById('imageFeed'+ndx).innerHTML;
 }
@@ -656,9 +706,9 @@ function initPage() {
     $j("#flipMontageHeader").slideToggle("fast");
     $j("#hdrbutton").toggleClass('glyphicon-menu-down').toggleClass('glyphicon-menu-up');
   }
-  if (getCookie('zmMontageLayout')) {
-    $j('#zmMontageLayout').val(getCookie('zmMontageLayout'));
-  }
+//  if (getCookie('zmMontageLayout')) { //This is implemented in montage.php And the cookies may contain the number of a non-existent Layouts!!!
+//    $j('#zmMontageLayout').val(getCookie('zmMontageLayout'));
+//  }
 
   $j(".grid-monitor").hover(
       //Displaying "Scale" and other buttons at the top of the monitor image
diff --git a/web/skins/classic/views/montage.php b/web/skins/classic/views/montage.php
index 9ef9dc97c..56852e958 100644
--- a/web/skins/classic/views/montage.php
+++ b/web/skins/classic/views/montage.php
@@ -60,6 +60,18 @@ $monitorStatusPositon = array(
 
 $monitorStatusPositonSelected = 'outsideImgBottom';
 
+$presetLayoutsNames = array( //Order matters!
+  'Freeform',
+  '1 Wide',
+  '2 Wide',
+  '3 Wide',
+  '4 Wide',
+  '6 Wide',
+  '8 Wide',
+  '12 Wide',
+  '16 Wide'
+);
+
 if (isset($_REQUEST['monitorStatusPositonSelected'])) {
   $monitorStatusPositonSelected = $_REQUEST['monitorStatusPositonSelected'];
 } else if (isset($_COOKIE['zmMonitorStatusPositonSelected'])) {
@@ -69,16 +81,30 @@ if (isset($_REQUEST['monitorStatusPositonSelected'])) {
 $layouts = ZM\MontageLayout::find(NULL, array('order'=>"lower('Name')"));
 $layoutsById = array();
 $FreeFormLayoutId = 0;
+
+/* Create an array "Name"=>"Id" to make it easier to find IDs by name*/
+$arrNameId = array();
+foreach ($layouts as $l) {
+  $arrNameId[$l->Name()] = $l->Id();
+}
+
+/* Fill with preinstalled Layouts. They should always come first */
+foreach ($presetLayoutsNames as $name) {
+  if (array_key_exists($name, $arrNameId)) // Layout may be missing in BD (rare case during update process)
+    $layoutsById[$arrNameId[$name]] = $name; //We will only assign a name, which is necessary for the sorting order. We will replace it with an object in the next loop.
+}
+
+/* For some reason $layouts is already sorted by ID and requires analysis. But just in case, we will sort by ID */
+uasort($layouts, function($a, $b) {
+  return $a->Id <=> $b->Id;
+});
+
+/* Add custom Layouts & assign objects instead of names for preset Layouts */
 foreach ( $layouts as $l ) {
   if ( $l->Name() == 'Freeform' ) {
     $FreeFormLayoutId = $l->Id();
-    $layoutsById[$l->Id()] = $l;
-    break;
   }
-}
-foreach ( $layouts as $l ) {
-  if ( $l->Name() != 'Freeform' )
-    $layoutsById[$l->Id()] = $l;
+  $layoutsById[$l->Id()] = $l;
 }
 
 zm_session_start();
@@ -173,30 +199,20 @@ foreach ($displayMonitors as &$row) {
   }
 } # end foreach Monitor
 
-if (!$layout_id) {
+if (!$layout_id || !is_numeric($layout_id) || !isset($layoutsById[$layout_id])) {
   $default_layout = '';
-  if (!$default_layout) {
-    if ((count($monitors) > 5) and (count($monitors)%5 == 0)) {
-      $default_layout = '5 Wide';
-    } else if ((count($monitors) > 4) and (count($monitors)%4 == 0)) {
-      $default_layout = '4 Wide';
-    } else if (count($monitors)%3 == 0) {
-      $default_layout = '3 Wide';
-    } else {
-      $default_layout = '2 Wide';
-    }
-  }
-  foreach ($layouts as $l) {
-    if ($l->Name() == $default_layout) {
-      $layout_id = $l->Id();
-    }
+  if (count($monitors) > 6) {
+    $default_layout = '6 Wide';
+  } else if (count($monitors) > 4) {
+    $default_layout = '4 Wide';
+  } else {
+    $default_layout = '2 Wide';
   }
+  $layout_id = $arrNameId[$default_layout];
 }
-$Layout = '';
-$Positions = '';
+
 if ( $layout_id and is_numeric($layout_id) and isset($layoutsById[$layout_id]) ) {
-  $Layout = $layoutsById[$layout_id];
-  $Positions = json_decode($Layout->Positions(), true);
+
 } else {
   ZM\Debug('Layout not found');
 }
@@ -242,7 +258,7 @@ if (canView('System')) {
       <div id="sizeControl">
         <form action="?view=montage" method="post">
           <input type="hidden" name="object" value="MontageLayout"/>
-          <input type="hidden" name="action" value="Save"/>
+          <input id="action" type="hidden" name="action" value=""/> <?php // "value" is generated in montage.js depending on the action "Save" or "Delete"?>
 
           <span id="monitorStatusPositonControl">
             <label><?php echo translate('Monitor status position') ?></label>
@@ -250,17 +266,17 @@ if (canView('System')) {
           </span>
           <span id="ratioControl">
             <label><?php echo translate('Ratio') ?></label>
-            <?php echo htmlSelect('ratio', '', '', array('id'=>'ratio', 'data-on-change'=>'changeRatioForAll', 'class'=>'chosen')); ?>
+            <?php echo htmlSelect('ratio', [], '', array('id'=>'ratio', 'data-on-change'=>'changeRatioForAll', 'class'=>'chosen')); ?>
           </span>
-          <span id="widthControl" class="hidden">
+          <span id="widthControl" class="hidden"> <!-- OLD version, requires removal -->
             <label><?php echo translate('Width') ?></label>
             <?php echo htmlSelect('width', $widths, 'auto'/*$options['width']*/, array('id'=>'width', 'data-on-change'=>'changeWidth', 'class'=>'chosen')); ?>
           </span>
-          <span id="heightControl" class="hidden">
+          <span id="heightControl" class="hidden"> <!-- OLD version, requires removal -->
             <label><?php echo translate('Height') ?></label>
             <?php echo htmlSelect('height', $heights, 'auto'/*$options['height']*/, array('id'=>'height', 'data-on-change'=>'changeHeight', 'class'=>'chosen')); ?>
           </span>
-          <span id="scaleControl" class="hidden">
+          <span id="scaleControl" class="hidden"> <!-- OLD version, requires removal -->
             <label><?php echo translate('Scale') ?></label>
             <?php echo htmlSelect('scale', $scales, '0'/*$scale*/, array('id'=>'scale', 'data-on-change-this'=>'changeScale', 'class'=>'chosen')); ?>
           </span> 
@@ -270,6 +286,7 @@ if (canView('System')) {
           </span>
           <input type="hidden" name="Positions"/>
           <button type="button" id="EditLayout" data-on-click-this="edit_layout"><?php echo translate('EditLayout') ?></button>
+          <button type="button" id="btnDeleteLayout" class="btn btn-danger" value="Delete" data-on-click-this="delete_layout" data-toggle="tooltip" data-placement="top" title="<?php echo translate('Delete layout') ?>" disabled><i class="material-icons md-18">delete</i></button>
           <span id="SaveLayout" style="display:none;">
             <input type="text" name="Name" placeholder="Enter new name for layout if desired" autocomplete="off"/>
             <button type="button" value="Save" data-on-click-this="save_layout"><?php echo translate('Save') ?></button>
@@ -325,6 +342,8 @@ foreach ($monitors as $monitor) {
   <script src="<?php echo cache_bust('js/MonitorStream.js') ?>"></script>
 <?php xhtmlFooter() ?>
 
+<?php echo '<script nonce="'.$cspNonce.'"> const ZM_PRESET_LAYOUT_NAMES = '.json_encode($presetLayoutsNames).' </script>'.PHP_EOL;?>
+
 <!-- In May 2024, IgorA100 globally changed grid layout -->
 <div id="messageModal" class="modal fade" tabindex="-1">
   <div class="modal-dialog">