Hey @Graham_Anderson,
Welcome to the community. You might be getting the pixelated image due to low resolution (480p), try increasing the resolution to 1080p. I couldn’t replicate the issue on our machines - there’s no visible difference between App window and Custom area in terms of image quality. Can you post screenshots to illustrate the difference?
There is no crop feature yet, but there’s a suggestion to add this feature, you can upvote it here.