diff --git a/js/ckeditor.on-init.js b/js/ckeditor.on-init.js
index eb725fb0b..9006b90f4 100644
--- a/js/ckeditor.on-init.js
+++ b/js/ckeditor.on-init.js
@@ -16,6 +16,20 @@ CKEDITOR.on('instanceReady', function (oEvent) {
 			$('#'+ oEvent.editor.name).closest('form').trigger('submit');
 		}
 	});
+	// N°4631 - Add a custom class to the CKEditor container when it is in fullscreen mode
+	// so elements know they should take into account intersecting with the editor
+	oEvent.editor.on('maximize', function() {
+		let container = this.container.getFirst( function( node ) {
+			return node.type === CKEDITOR.NODE_ELEMENT && node.hasClass( 'cke_inner' );
+		} );
+		if (this.commands.maximize.state === CKEDITOR.TRISTATE_ON) {
+			// The editor is in fullscreen mode, add the custom class
+			container.addClass('ibo-is-fullscreen-non-intersecting');
+		} else {
+			// The editor is not in fullscreen mode, remove the custom class
+			container.removeClass('ibo-is-fullscreen-non-intersecting');
+		}
+	});
 });
 
 // For disabling the CKEditor at init time when the corresponding textarea is disabled !
diff --git a/js/components/panel.js b/js/components/panel.js
index c17679e25..45a0db7b9 100644
--- a/js/components/panel.js
+++ b/js/components/panel.js
@@ -132,10 +132,18 @@ $(function () {
 				})
 					// ... we consider the header as sticking...
 					.on('enter', function () {
+						// N°4631 - If a non-intersecting element is fullscreen, we do nothing
+						if ($('.ibo-is-fullscreen-non-intersecting').length > 0) {
+							return;
+						}
 						me._onHeaderBecomesSticky();
 					})
 					// ... and when it comes back in the viewport, it stops.
 					.on('leave', function () {
+						// N°4631 - If a non-intersecting element is fullscreen, we do nothing
+						if ($('.ibo-is-fullscreen-non-intersecting').length > 0) {
+							return;
+						}
 						me._onHeaderStopsBeingSticky();
 					})
 					.addTo(this.sticky_header_controller);
diff --git a/js/layouts/tab-container/tab-container.js b/js/layouts/tab-container/tab-container.js
index 985127f00..3db0d03d8 100644
--- a/js/layouts/tab-container/tab-container.js
+++ b/js/layouts/tab-container/tab-container.js
@@ -141,6 +141,10 @@ $(function()
                 // Resize of the tab container
                 if(window.IntersectionObserver) {
                 	const oTabsListIntersectObs = new IntersectionObserver(function(aEntries, oTabsListIntersectObs){
+						// N°4631 - If a non-intersecting element is fullscreen, we do nothing
+						if ($('.ibo-is-fullscreen-non-intersecting').length > 0) {
+							return;
+						}
                 		aEntries.forEach(oEntry => {
                 			let oTabHeaderElem = $(oEntry.target);
                 			let bIsVisible = oEntry.isIntersecting;