How do I have a 4x3 media mode vs 16x9 media mode

I'm having problems every time I switch the game I'm playing from 4x3 to 16x9 if I play a 16x9 game and it fits perfectly in the way I want, the 4x3 is horizontally the same width as a 1699 but pulls down further and runs over certain cameras. How do I make sure when I transition between 16x9 and 4x3 media that the height is the fixed constant not the width?

It seems like everyday I have to take 15 minutes adjusting obs to get the right ratio of the video.

By the way currently because my cell phone is my best bandwidth I'm doing this commando style which means pointing a camera at a monitor and using the phone band with to directly use streamlabs OBS on Android. But I do use regular OBS on Mac as the "screen organizer" so I can have multiple camera angles on me and the game footage highlighted.
 
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