If your Kindle currently looks like this, it's a known issue and Amazon is apparently working on it : r/kindle
Kindle Paperwhite Signature Edition (32 GB)
Kindle Paperwhite Signature Edition (32 GB)
How to read ebooks in Landscape Mode on your Kindle Paperwhite | Lia Belle
Amazon Kindle Paperwhite (2021) - Review 2023 - PCMag UK
Amazon adds a night time reading mode to its Fire tablets to help you sleep
How long does Kindle Paperwhite last (device itself not battery)? Some reviews on Amazon say that it's good for a year and becomes useless after that. - Quora
Upgraded to a Paperwhite after 8 years with my Fire tablet! : r/kindle
Kindle Paperwhite 2021 review: A better screen and a nearly perfect size - CNET