If an application is optimised to be a full screen app, you're unable to exit full screen. Because Instagram and Snapchat are optimised to run full screen, you can't do this.
The option for Full Screen Apps within Settings is there so users can use the full screen on the S8 and S8+, even if the app hasn't been optimised for use with Infinity Display by the developer.
How the he'll are you getting full screen Instagram?I've tried every thing but can get rid of the it tool bar at the bottom
Double tap the dot on the left of the bottom bar. Update your software if it isn't there.
Lol that is not how to remove the it tool bar.that is how to hide the touch wiz tool bar.the ok says he is using it in full screen.i have my tool bar hidden and status bar hidden using immersive mode.but the it app is not full screen there is the it bar at the bottom .here is a screen shot of ig as you can see the Instagram tool bar is there