# How to customize UI? **URL:** \ **Category:** Technical Support\ **Created:** [November 29, 2021, 12:43am UTC](https://pdfjs.community/t/how-to-customize-ui/1199 "2021-11-29T00:43:07Z")\ **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:** [November 29, 2021, 12:43am UTC](https://pdfjs.community/t/how-to-customize-ui/1199/3 "2021-11-29T00:43:12Z")
**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: - [Default UI for WebViewer - How it works behind the scenes](https://pdfjs.express/documentation/ui-customization/default-ui#how-it-works-behind-the-scenes) - [Customize toolbar in viewer - Header items - StatefulButton](https://pdfjs.express/documentation/ui-customization/customizing-header.8#statefulbutton) - [Changing themes & colors using JavaScript - Override CSS variables](https://pdfjs.express/documentation/ui-customization/themes#override-css-variables) APIs: - [UI.Hotkeys - off( [key] [, handler])](https://pdfjs.express/api/UI.Hotkeys.html#.off__anchor) - [UI.Popup](https://pdfjs.express/api/UI.Popup.html#__anchor) - [UI.PageManipulationOverlay - add(PageManipulationSection [, dataElementToInsertAfter])](https://pdfjs.express/api/UI.PageManipulationOverlay.html#add__anchor) Forums: - [Compiled Webviewer Installation](https://pdfjs.community/t/compiled-webviewer-installation/209/3) - [How to show only one page at a time in viewer](https://pdfjs.community/t/how-to-show-only-one-page-at-a-time-in-viewer/940/6) - [Add custom button to the Menu](https://pdfjs.community/t/add-custom-button-to-the-menu/1093/1) --- _[View the full topic](https://pdfjs.community/t/how-to-customize-ui/1199)._