Uninstalling Muse Sounds from Muse Hub is broken on Linux
The GUI explains you have to press Alt to activate the uninstall button underneath each downloaded Muse Sounds. However most window managers on Linux use the Alt key + left mouse button to move the window; instead of interacting with the GUI. So I expect most Linux users, like me, will not be able to uninstall Muse Sounds via the Muse Hub GUI.
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For issues with Muse Hub specifically, please see their support site at musehub.zendesk.com. In particular, see this issue - https://musehub.zendesk.com/hc/en-gb/community/posts/8655855115549-Alt-… - and the workaround that seems to work for me. Feel free to followup there with any additional info about window manager - I had assumed this might be unique to Chromebook installations.