Black bar on top and bottom of screen

[yatishgowdru17]

Model:ZS661KS-6A006IN
Firmware version:WW_18.0410.2106.138
Non rooted
Occurs always
In full screen apps

Hey....i am having this issue after updating to the latest Android 11....there are two bars on the top and bottom of each app..it is really messing up everything.....I can't even play pubg now due to this....any help is appreciated,Tq.

[ARP_ASUS]

Hi,
You can try few things:
Change wallpaper
Go to Display => System navigation => Change back and forth to see if it helps.
Restart
Reinstall the App (Let me know if the issue is with more apps, list them)
Factory reset finally