Same, got a 14PM and I checked the YouTube app settings and in iPhone settings but nothing indicates that a toggle has to be switched on or off. I checked with another video app (Amazon Prime) and the soundbar appears so this is strictly an issue with the YouTube app.
wolfenmaara t1_je7de07 wrote
Reply to Another 16.4 bug. 14PM. No sound bar while changing volume up/down in YouTube while in full screen. by Upbeat-Truck-1833
Same, got a 14PM and I checked the YouTube app settings and in iPhone settings but nothing indicates that a toggle has to be switched on or off. I checked with another video app (Amazon Prime) and the soundbar appears so this is strictly an issue with the YouTube app.