# Set Mobile Header Height **URL:** \ **Category:** Technical Support\ **Created:** [June 21, 2022, 11:01am UTC](https://pdfjs.community/t/set-mobile-header-height/1794 "2022-06-21T11:01:23Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\ **Post date:** [June 21, 2022, 11:01am UTC](https://pdfjs.community/t/set-mobile-header-height/1794/3 "2022-06-21T11:01:26Z")
**Hello, I’m Ron, an automated tech support bot 🤖** While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages: Guides: - [Customize toolbar in viewer - Header items - CustomElement](https://pdfjs.express/documentation/ui-customization/customizing-header.8#customelement) - [UI & toolbar customization sample](https://pdfjs.express/documentation/ui-customization/samples) - [Hiding/Showing DOM elements in WebViewer UI - List of elements](https://pdfjs.express/documentation/ui-customization/hiding-elements#list-of-elements) APIs: - [WebViewerInstance - setActiveHeaderGroup(headerGroup)](https://pdfjs.express/api/7.0/WebViewerInstance.html#setActiveHeaderGroup__anchor) - [UI - enableDesktopOnlyMode()](https://pdfjs.express/api/UI.html#.enableDesktopOnlyMode__anchor) - [Core.DocumentViewer - setScrollViewElement(scrollViewElement)](https://pdfjs.express/api/Core.DocumentViewer.html#setScrollViewElement__anchor) Forums: - [Create new toolgroup](https://pdfjs.community/t/create-new-toolgroup/149/4) - [How to set default page transition when viewer loads](https://pdfjs.community/t/how-to-set-default-page-transition-when-viewer-loads/761/5) - [How to set the maximum size of an annotation?](https://pdfjs.community/t/how-to-set-the-maximum-size-of-an-annotation/1068/4) --- _[View the full topic](https://pdfjs.community/t/set-mobile-header-height/1794)._