I have my 2 set so that I can manually change orientation (the little rectangle pops up in the "lower right corner" when I rotate the phone. If I tap it, it changes orientation. It works if I have Maps on the screen. (I can't see using it that way - I have the map set for North-up, but I mostly use it for audible direction, so I want to see more north and south than more east and west.)
It should work on the 3 the same way. (And it's just a tap to rotate the screen, something you can get used to quickly. [Or you can have the auto-rotate quick icon in the pulldown to switch modes between auto rotate and manual rotate.])
I just notices - with autorotate on, Maps rotates to landscape mode automatically. (I'm running Android 11 - you should have updated by now.)