Assuming you would like to hide the status bar and navigation bar on your Android device, there are a few different ways you can do this.
One way is to enable immersive mode. Immersive mode will hide the status and navigation bars until you swipe in from the edge of the screen or tap on the screen where they're located. To enable immersive mode, go to Settings > Display > Advanced > EnableImmersiveMode.
Another way to hide the status and navigation bars is by using a third-party app. There are a few different apps you can use, but we recommend using Hide Navigation Bar. This app will allow you to schedule when the status and navigation bars are hidden and also has an option to hide them while using specific apps.
To use Hide Navigation Bar, first install it from the Google Play Store. Once it's installed, open the app and grant it access to modify system settings. Then, turn on the 'Hide Status Bar' and 'Hide Navigation Bar' options. You can also schedule when these bars should be hidden by tapping on the 'Scheduler' tab at the bottom of the screen.