To hide icons on the top bar of an Android device, you can use the following steps:
1. Open the "Settings" app on your Android device.
2. Tap on the "Display" option.
3. Tap on "Status Bar" and then select "Hide All Icons".
4. Tap "OK" to confirm and all icons on the top bar of your Android device will be hidden.
It is important to note that some apps may not be compatible with the "Hide All Icons" feature, so you may have to manually hide the icons of those apps. Additionally, some devices may have a different method of hiding icons, so you may have to refer to the manufacturer's documentation.