Car play question

I have a wireless car play adaptor that works fine. What I would like to know is what determines what apps make it on the display. I know there is a list in setup/general/carplay. What I don't understand is what decides whats in the list. I have a silly police scanner app that is on the list that I don't care to have there and the app to open my driveway gate is not. I would love to be able to open the gate via touch screen instead of picking up the phone, open the app and hitting the button.
Any help? Thanks, Charles

 

I just fumbled through mine to try to help you but don’t see where to delete and add apps either

 

Ok you do it from your phone

 

Here’s the menu options

 

Not sure if you can delete the apps, but you can re-arrange them. Can always put it at the end.

If your driveway gate is controlled by HomeKit it should show up. My garage door does. It's location aware, so it only shows it as I'm approaching home.

 

I understand this is where it's done but can't get my app to show up in that list. Any trick to do that?

 

Only approved apps are compatible with Apple Carplay or Android Auto.

https://support.apple.com/guide/iphone/use-other-apps-with-carplay-iph206c570e3/ios

https://support.google.com/androidauto/answer/6348031?hl=en

 

Yup sadly only apps that Apple approves will work on carplay.