Disable Reading Aloud of Phone Messages
I decided it's an absolutely pointless feature, espectially as every smartphone can already do this itself.
I tried to switch it off. Logically this would be in Settings / Sounds & Warnings.
But being a TomTom customer for many years, I knew that nothing could be that simple.
In case anyone else is struggling, it's in Bluetooth.
Feedback for TomTom, please copy the smartphone guys, put sound options in a menu with "sound" in the title..