Keep Timer+ Open on Screen
When you are checking a timer from across the room, you may want to keep the display on. Turn on Prevent Auto-Lock in Timer+ to stop your device from dimming and locking while the app is open.
This setting only applies while Timer+ is in the foreground. It does not change your device’s system Auto-Lock setting or keep the display on after you leave the app.
Keeping the display on uses more battery, so turn Prevent Auto-Lock off when you no longer need it.