Checklist:
[X] I have checked that there are no issues with similar or the same content
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OS: macOS Catalina 10.15.7 (19H2)
GPMDP Version: Version 4.7.1 (4.7.1)
Issue Descriptions:
Today was closed my access to Goole Play Music, but on this new webpage, I can't switch to YouTube Music, because there is no button.
Steps to Reproduce:
Open GPMDP and show this screen.

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Use the tray icon on the top bar in Mac.
Done! Thanks!

You can also click Transfer to youtube music then you get to a side, where you can pick if you actually want to transfer or skip.
The downside is, that the application will ask you again on next start, as it thinks you want gmusic to start.
Use the tray icon on the top bar in Mac.
Worked for me. Thanks!
Any options for those of us using Linux?
The same "transfer" button or tray icon selector as mentioned for macOS work fine for me on Linux to get into YT music mode.
It would be nice if somebody sent in a PR to make this the default/only mode now that we don't have other options.
I had to install a gnome extension, that enables tray icons, switch the app over and Uninstaller the extension
That worked for me!
Most helpful comment
Done! Thanks!