As of the latest official release, I am unable to use the audio popup on the system tray on non-primary monitors. It will pop up, but trying to change the audio output is not possible as it ends up behind the taskbar. The matter is made even worse on monitors with scaling enabled, as it does not even show up correctly. (see picture)

Not sure if this was reported already or fixed in beta, but I did not see any recent discussions on the matter.

Thank you! Updating to beta fixed the majority of the issue. It now works as intended on my second (normal) monitor.

However, it still looks the same on the scaled monitor, with half the popup as a white box. Windows scaling screws up a lot of things and I rarely use the taskbar on that screen so it's not a big deal, but it might be something you can fix in a future version.