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```systemUiController.isNavigationBarVisible = false
systemUiController.isSystemBarsVisible = false```
I’m using those functions to make my app full screen, when touching my app navigation bar is appearing again. what I want to achieve is to develop a blocker app so user can’t access system buttons, is that possible?

Maybe you want something like `Activity.startLockTask()` ? Here the docs <https://developer.android.com/work/dpc/dedicated-devices/lock-task-mode>

An app blocking system buttons isn't possible AFAIK. The most you can do is override back, but the user should always be able to go home. You might want to look into kiosk mode

Correct, you cannot make an app that prevents interacting with System UI, for many good reasons.

There is an app doing it called LockMeOut