How to watch without black bars on all sides

Plex Players Desktop Players
1

Server Version#: latest
Player Version#: windows

For some reason i can not upload a picture but my problem is what the title says black bars on all sides instead of 0 or 2 sides

2

It’s hard to know which app you’re using, but the following will show you how to get to playback settings:

3

On top of the above, it is advisable to store only video files without any black borders in their picture.