Oh would you mind telling me what resolution you have and what scene u are looking at? It might be a problem on my side
I have an ultrawide screen with a resolution of 3440x1440 - it's not a specific scene but just generally cutting off top and bottom everywhere. Had to run it on a secondary screen. I'm assuming that either Unity standard settings or a common implementation for fullscreen will stretch the image to the width of the screen for a regular widescreen aspect ratio. I've seen this issue with a couple of Unity games.
201 days ago(+1)
It's cut off in the bottom. Here's a full screenshot of what I'm seeing:
The problem and solution are well summarized in this somewhat dated discussion, but maybe it's pointing you in the right direction:
https://www.reddit.com/r/gamedev/comments/avoiom/how_to_support_all_screen_size_...