Disconnect from Real Time Connection (React Native)

I have implemented the use of real time connection in my school project that is built with React Native and Expo. I have followed the documentation from the site that shows on how to unsubscribe. From what I have gathered from other sources and videos explaining its use when doing so in React calling it in a cleanup function should and does prevent more connections from being made to the same event. The problem that I am having is not being able to disconnect the real time connection when the unmount occurs when the current screen is not in focus. Is there something else that I am missing that I need to do? The docs seem like it should disconnect from it, maybe it should and react/react native does something differently that I do not know.