hide page titel and header size

Hello there! I have three questestion: 1. How can I hide/get rid of the page titel? 2. The image size for the header in the theme description says "Width: 1920, Height: 1080", but the picture is totally cut off! It's way too narrow for my pictures like this. 3. How can I display a different header picture on every page? I couldn't find it in the theme adjustments. Thank you for your support! :-) Kind regards, Nathan