Presenter video is very small when recording a PowerPoint video

It is not clear exactly what you are doing. Are you playing a video in Zoom via screen sharing, playing a Power Point slide show which contains a video, or something else. Make sure your slides are the same resolution as the video. The Zoom recording sets its recording resolution from the contents resolution at the beginning of the Zoom recording.

If this works please click accept as a solution.

I'm recording a PowerPoint presentation.  As I'm recording, the size of the presenter feed (Me) is sized just right.  After I'm done recording, the presenter feed in the recorded PowerPoint is much smaller than it was while recording.  Does that help?