My mother is 100 and has macular degeneration. Her eye doctor recommended the Kindle Paperwhite. She has never used a computer and I bought a Paperwhite and set it up for her. The backlighting and large font works great for her but I need a way to limit the screens she sees to just the pages of the book she is reading. Is there any way to have it open to the book only? She can’t see the options because they are tiny and she wouldn’t know what choices to make anyway. We can change the book for her as needed and download books using our WiFi. Any suggestions?