The toolbar in Web Access shows briefly after connecting. If the user doesn't interact with the toolbar, it will automatically hide after 2 seconds. The toolbar can be moved to either side, but as standard it appears on the left side. If a user has moved the toolbar to the right side, this preference will be saved to the browsers web storage, and this preference will be used for future Web Access sessions. A bug prevents the animation from working for this first close of the toolbar. Subsequent opens and closes works fine.
Fix committed upstream: https://github.com/novnc/noVNC/commit/06309160ee25b7b99c96008f3d4d28933b097715
Tested after vendor drop (Build 6278) on: * Windows 10 - IE 11, Edge 18, Chrome 78 and Firefox 70. Works fine on these!
Verified this as well and it works fine on Windows 10 - IE 11, Edge 18, Chrome 78 and Firefox 70.