Do you find the new full screen optimisation annoying? I do! On the Samsung S8 I lost the menu bar down the bottom all of a sudden, and I couldn’t for the life of me figure out how to get it back.
Then I understood!
In order to get the button bar back, you have to make sure it’s no longer optional. In settings, turn off the “hide button”, and the pesky full screen is fine, ensuring I can still use the phone with my massive hands and thumb!