I would like to change a couple of settings on my printer but I'm not sure if it's possible.

1) paper size in scan settings is set to A4 but I would like it to be letter. Every time I scan I go to check and it's set to A4 again. The scan cuts off a portion of my page.

2) I would like the screen to stay on a little longer and not go to sleep. Is there a setting for this somewhere? When I'm scanning multiple documents and there's too much time in between, the machine goes to sleep and I have to start all over again.

Thank you for any assistance.