From dd798fd634b980b3cd581be40cdccdab8f4f7fa4 Mon Sep 17 00:00:00 2001
From: Julia Radzhabova <Julia.Radzhabova@onlyoffice.com>
Date: Wed, 6 Sep 2023 19:52:09 +0300
Subject: [PATCH] [PE] Fix Bug 63863

---
 apps/presentationeditor/main/app/controller/Viewport.js  | 2 +-
 apps/presentationeditor/main/app/view/DocumentPreview.js | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/apps/presentationeditor/main/app/controller/Viewport.js b/apps/presentationeditor/main/app/controller/Viewport.js
index 17a35451b3..7bf8e7b0b8 100644
--- a/apps/presentationeditor/main/app/controller/Viewport.js
+++ b/apps/presentationeditor/main/app/controller/Viewport.js
@@ -284,7 +284,7 @@ define([
                     me.api.StartDemonstration('presentation-preview', _.isNumber(slidenum) ? slidenum : 0, reporterObject);
                     Common.component.Analytics.trackEvent('Viewport', 'Preview');
                 };
-                if (!me.viewport.mode.isDesktopApp && !Common.Utils.isIE11 && !presenter) {
+                if (!me.viewport.mode.isDesktopApp && !Common.Utils.isIE11 && !presenter && !!document.fullscreenEnabled) {
                     Common.NotificationCenter.on('window:resize', _onWindowResize);
                     !fromApiEvent && me.fullScreen(document.documentElement);
                     setTimeout(function(){
diff --git a/apps/presentationeditor/main/app/view/DocumentPreview.js b/apps/presentationeditor/main/app/view/DocumentPreview.js
index 6aae0d62f8..f595195183 100644
--- a/apps/presentationeditor/main/app/view/DocumentPreview.js
+++ b/apps/presentationeditor/main/app/view/DocumentPreview.js
@@ -346,7 +346,7 @@ define([
 
         setMode: function(mode) {
             this.mode = mode;
-            if (this.mode.isDesktopApp || Common.Utils.isIE11) {
+            if (this.mode.isDesktopApp || Common.Utils.isIE11 || !document.fullscreenEnabled) {
                 this.btnFullScreen.setVisible(false);
                 this.separatorFullScreen.hide();
                 $(document).off("webkitfullscreenchange mozfullscreenchange fullscreenchange MSFullscreenChange");