I use Waze for navigating on Android auto, and use ABRP to plan route and monitor battery status. But even if I turn off the Route Directions ABRP still gives directions to the speakers. Even if I turn it off.
I just tried this and when i click the mute icon for muting voice instructions i do not get voice output from ABRP app anymore. Can you please provide more information, what exactly you did to turn off voice instructions from ABRP?
I found out what was the problem. I had disabled Route Directions. That had hidden the other options including the Voice Guidance. After enabling Route Directions and then disabling Voice Guidance, and after that disabling Route Directions it no longer gives any directions. Still a bug I would think if I disable Route Directions but left the voice prompt on, and the app then hides it, I would expect that it is completely disabled.