The Chrome Canary update Version 79.0.3911.0 will help users keep the Global Media Controls menu tidy, by giving them the option to remove unwanted sessions from the dialogue box.
An “x” button has been introduced to the top right-hand corner of each individual session, so users can choose what music they want to quickly access while still having multiple other sessions open in the background.
The changelog includes the following description:
GMC: Add ability to dismiss a media session.
This CL adds an X button to the sessions in the Global Media Controls dialog (when paused) that dismisses the session from the dialog. This also updates the MediaNotificationContainer API to receive MediaSessionInfo updates and foreground color updates so that we know when to show the button and what color to make it.
Thanks, Leo, for the tip.