Yes, there is a little rectangular button to hide the sidebar. The button is near the top-left side of the sidebar (top right of the screen in general). Also if you have Advanced Keyboard Shortcuts enabled, there is a Hide Sidebar shortcut (w), Wiki Documentation for this: <a href="https://wiki.roll20.net/Advanced_Shortcuts" rel="nofollow">https://wiki.roll20.net/Advanced_Shortcuts</a> Some fellow Roll20 users also offered more projector tips for hiding even more of the interface in this old forum thread, <a href="https://app.roll20.net/forum/post/1174957/hide-ui#" rel="nofollow">https://app.roll20.net/forum/post/1174957/hide-ui#</a>...