This is a basic problem, but not fixing it is a huge one. Samsung Notes has no horizontal landscape mode while the other note apps such as Goodnotes, Notable and NoteIn have. And I know that I can use Goodnotes since its preloaded app for samsung tabs. However, the AI and wireless pen functionalities that come with the SNotes will no longer be an option. I know that this basic problem exists for more than 5 years. Also yes, I dont want to rotate my screen with locking screen vertically 
Using Galaxy Tab s10+
#Galaxy Tab S10
#SNotes
