palm rejection button: this button makes you can grab any part of screen, so you can freely grab your tablet just like a book.
when you select this mode, xodo shows you next and previous button, so if you want to move pages, you should press these buttons. and the top menu and bottom navigation bar are still working on palm rejection mode, so you can also use this menus as usual. your active pen is also working as usual, so you can write down something. palm rejection mode just blocks page moving.