Yup it's a nightmare. I had the same problem. Look in quick menu, is there a button called portrait that is highlighted? Touch it to change back to auto rotate ... Tada!
Why Samsung didn't just put auto rotate on and off I have no idea.
Thank you this had me confused as hell samsung needs to stop shutting off this setting when updates. Whoever decides samsung updates designs should be fired immediately
Thank you for posting this I've never used the Samsung members app Before. I just downloaded it and I don't see an optimized menu in There. I'm not sure where to go. I don't have an auto rotate a portrait or landscape button I've looked in the menu bar I've done searches I've tried the accessibility I tried to chat with customer support they suggested a hard factory reset
I know this is an old thread, but I just had to say THANK YOU! You're a genius. This auto-rotate "portrait" thing had be going crazy for DAYS!!!! Thank you.