Why is my tablet not able to rotate using kindle to landscape mode anymore

[AC Question]

Ive been using kindle on my samsung galaxyTab S for a long time. Suddenly, I am only able to view the book on kindle in portrait mode. Cannot figure it out.

 

[anon(9983233)]

Possible Solution:

https://www.cnet.com/how-to/how-to-enable-or-disable-kindle-app-screen-rotation/

Source: CNET.com

Assuming the book you're reading can be rotated.. often you may encounter books or sites which can not be rotated simply because they (the site owner) has not allowed for this type of rotation.