Some Android devices aren't compatible with the System UI Tuner, a program introduced by Android that allows users to customize the status and navigation bars on the device interface or make an app viewable on full screen. It also lets you activate the night mode and dark theme and turn icons on and off in the status. However, if your phone does not allow these capabilities, you can use the UI Tuner Enable app.

UI Tuner Enable allows the System UI Tuner to function on devices, such as HTC One A9, that limit this app by default. To activate this app, you need to root your device. Keep in mind that not all UI Tuner functionality may work once you have enabled the app.