@Nationalsolo I usually shoot 16:9 on my cell phone but output 4:3 for Instagram. I used the zoom tool to highlight the section of the wider video I wanted in the narrower Instgram frame.
I typically saw the black bars while editing, then output at 4.3 and accepted the crop prompt. It worked pretty well!
So I want 4.3 output from the 16.9 where I move the frame around without any aspect ration problems.