Screen share is showing small

I've been recording a lecture which included screen sharing.

While in the session, everything seemed fine, screen share was on full screen and presenter thumb was at the top right.
After the meeting when I went back to the recording, it seems that the screen sharing was recorded in a very small size, making it almost unusable.

I couldn't find any documentations for that.

Happy to get your thoughts as to how to prevent this in the future.