BACK [<] button gone in some conditions
In some conditions, the back button on the top left is gone. To make it re-appear you need to toggle the video full screen.
One of the conditions when the button sometimes disappears is when you reopen the Videos application, and it will automatically return to the previously played video or an online stream.
The activated plugin are:
- MPRIS D-Bus Interface
- Subtitle Downloader
The button disappears occasionally (twice last week), so I am aware it will be difficult to troubleshoot for you.