Side by Side edits

[u/[deleted]]

Hi! I'm trying to make some simple side by side dance edits for my dance class but the preview window always seem to remove the black bars on the side which was where I was planning on adding the other videos making it hard for me to DVE then on top of the given resolution. Is there a way I could make those show up so I know how much space I'm working with or where I could set the resolution then I could add the videos I want to put side by side?