Full Screen mode is too wide

[DiMono]

Whenever I go to full screen mode on a video whose relative width is greater than the screen, the video is enlarged until the height matches, meaning I lose the edges of the video. This doesn't happen when the video is too tall, only too wide.

[Quietseb]

are you sure that you don't have pan&scan enabled ?
(right-click on the video -> video -> pan-scan

[well pan-scan is not enabled by default (I mean whenever I close/reopen bsplayer, pan-scan is disabled) so this sounds strange...]

[bst]

Check if you have enabled 'Cut top and bottom of video in full screen mode' option. Under Preferences->Video->General

[Cherwally]

Disabling Pan-Scan mode (i had on Auto), it fixes the problem.
Click on Menu => Video => Pan-scan (Deselect Auto to disable)

[alexjohnson9099]

Make sure the 'Cut top and bottom of video in full screen mode' option is enabled. You can find it under Preferences → Video → General.