Forced connection issue

[Annoyed69]

My wife has a Google speaker for playing her music in the house. For some ungodly reason my phone is forced the ability to fully control the speaker while connected to the wifi. How do I disable this or remove my phone from being able to be forcibly connected to the speaker.

[GBD]

I'm assuming you're talking about the media control that shows up in the notification panel on your phone. If so, follow the instructions under " Turn off Cast media control notifications on your phone" from here https://support.google.com/chromecast/answer/7206638?hl=en 

Turn off Cast media control notifications for your device