diff --git a/apps/presentationeditor/main/app/template/Viewport.template b/apps/presentationeditor/main/app/template/Viewport.template
index 960edecea5..5307c1f082 100644
--- a/apps/presentationeditor/main/app/template/Viewport.template
+++ b/apps/presentationeditor/main/app/template/Viewport.template
@@ -1,5 +1,5 @@
 <div class="layout-region">
-    <div id="pe-preview" style="position:absolute; left: 0; top: 0; display:none; width:100%; height:100%; z-index: 1;"></div>
+    <div id="pe-preview" style="position:absolute; left: 0; top: 0; display:none; width:100%; height:100%;"></div>
     <section class="layout-ct">
         <div id="file-menu-panel" class="toolbar-fullview-panel" style="display:none;"></div>
     </section>
diff --git a/apps/presentationeditor/main/app/view/Toolbar.js b/apps/presentationeditor/main/app/view/Toolbar.js
index 008bf3ee23..30e9848434 100644
--- a/apps/presentationeditor/main/app/view/Toolbar.js
+++ b/apps/presentationeditor/main/app/view/Toolbar.js
@@ -109,6 +109,8 @@ define([
                 me.shapeControls = [];
                 me.slideOnlyControls = [];
                 me.synchTooltip = undefined;
+                me.needShowSynchTip = false;
+
                 me.schemeNames = [
                     me.txtScheme1, me.txtScheme2, me.txtScheme3, me.txtScheme4, me.txtScheme5,
                     me.txtScheme6, me.txtScheme7, me.txtScheme8, me.txtScheme9, me.txtScheme10,
@@ -1254,7 +1256,6 @@ define([
 
                 /** coauthoring begin **/
                 this.showSynchTip = !Common.localStorage.getBool('pe-hide-synch');
-                this.needShowSynchTip = false;
 
                 if (this.needShowSynchTip) {
                     this.needShowSynchTip = false;
diff --git a/apps/presentationeditor/main/resources/less/document-preview.less b/apps/presentationeditor/main/resources/less/document-preview.less
index a5f751d95b..dc6160cfb9 100644
--- a/apps/presentationeditor/main/resources/less/document-preview.less
+++ b/apps/presentationeditor/main/resources/less/document-preview.less
@@ -1,3 +1,6 @@
+#pe-preview {
+    z-index: @zindex-navbar+3;
+}
 .preview-controls {
     display: table;
     background: @gray-light;