How to turn on/off button on screen with send intent in app like tasker: 1. Intent to hide the app
Action com.oksoft.hide Extra hide:1 Package com.alwaysvolumebutton Class com.alwaysvolumebutton.OnLock_BroadcastReceiver Target Broadcast Receiver
2. The intent to show the app. Action com.oksoft.hide Extra hide:2 Package com.alwaysvolumebutton Class com.alwaysvolumebutton.OnLock_BroadcastReceiver Target Broadcast Receiver
For other always visible apps, just change the package name.