This can be done via the app.

In the lock page where you see the bluetooth unlock icon, tap on 'Settings' at the bottom right hand corner of the screen.
Scroll down and tap on 'Auto Relock Timer'.
Here, you can choose the Auto Relock Timer duration, or you can choose to tap 'Never Relock' to deactivate this function.

Article Number:IHIGR1005
File Type:General Public (GP)