Can't move self-view window to another corner of the screen?

I recently got an iPad, and everything in the Zoom app works fine--except I can't figure out how to move the window with my picture (or the sharer's picture, if someone is sharing screen) around to a different corner of the screen. When I try to drag it, nothing happens. I can't find any settings that affect this, or any advice on Google. Has anyone experienced this? I have tried uninstalling and reinstalling the Zoom app.