Bluetooth call / media sound turn on / off

Dear Community!

I have a problem with the bluetooth connection in my car. Usually I hear the radio and make some calls through the bluetooth connection and sometimes I use my phone for navigation. The problem is that I don’t hear the navigation sounds. I think the phone plays through it as a bluetooth media sound but because of i’m hearing the radio, my car doesn’t “play” it.

I would like to turn off on my phone the bluetooth media playing with my car and use it only for calls. How can i do it?

And the other problem in the same topic with my bluetooth speaker.

I don’t want it to use for calling, only for media playing. How can i turn the calling off?

I’m a new ios use, in android i had the option for all paired bluetooth devices to turn on/off the media or call sounds.