How to switch off sound on Homebase 2 completely

I have hidden my Homebase 2 so it won’t be discovered in the event of a theft. Unfortunately it always makes noise when the router is switched off (“Homebase is switching to WiFi mode” or “Homebase is switching to ethernet mode”). So the homebase can be easily discovered!
(My videodoorbell is on the original doorbell)

In the app, I have the volume, ringtone settings at 0, and the homebase notification is off.
The warning tones are set to ‘Stil’/silent.
The ringtone settings are off.
The alarm volume is also turned off and the quick/fast volume is at minumum… And I still hear the Homebase.
Any suggestions?

What setting is the prompt volume at?
Also, may need to get rid of the WiFi connection. Don’t need it with the wired connection anyhow.

Set Prompt Volume of Homebase to 0. All sound is now off.