On: Last Week on My Mac: Losing confidence

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Sounds like the revived Unity/Unity7 still has a global menu bar, and there's a version called UnityX with Wayland support.

https://9to5linux.com/unity-7-7-desktop-environment-to-get-a...

https://unityd.org/unityx-7-7-testing/

https://gitlab.com/ubuntu-unity/unity-x/unityx#manual-instal...