Thank you for this! I was scratching my head on why my volume was so low the last couple days and finally got it back. I did have to leave it on off, otherwise it kept going back to low volume when I open the app the next time, same as your experience.
This is so stupid! Why would you take this function away from us? I use this often. If I had known the update would take away this option, I wouldn't have installed it!
Please reverse this decision to remove it from our power button screen!