video meetings with share screen recorded on Zoom

Hi all!
Who can help me regarding the meetings recorded on Zoom?

How to make the meetings be recorded in higher quality, even if they are saved in mp4 when I watch them, these videos are not high quality anyway, especially the shaded screen looks bad.

Another question is that when I share the screen, namely a portion of the screen, a video with me is automatically placed in the upper right part of the recorded meetings (see screen 2 of a recorded video). Even if I put it in different places of the screen during the meeting (see screen 1 during the recording) anyway in the recorded video it shows me in the upper right.

How to solve these problems?

Thank you very much!

Andrian