New UI doesn't properly fullscreen videochat

I use a 4:3 monitor and the person I commonly videochat with has a camera that outputs at 4:3 as well. The video feed used to fit flush to my screen but now it's squished to fit into a 16:9 layout which is then cropped again to fit into my square ass monitor, resulting in massive bars on the top, bottom, and sides of the video feed. Please allow video feeds to be fit to the screen instead of resized for 16:9.