I have also had this problem on
stable build 84 (356bd53), 2026-03-06 03:57:38 UTC, Electron 39.2.7, Windows 11 10.0.26200 (x64), desktop stable 0.0.8
The UI will disappear if I start screensharing, and come back when I stop. It also disappears on its own, I think if I go somewhere else in the app and return to the DM.
If I go to 'Friends', then click my friend's screenshare in Active Now (while I am in the call), it goes to the DM without the call UI returning (making me unable to actually view the screenshare).
Can confirm that this issue doesn't seem to occur in a community voice chat.
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Comment by @NinjaHamster404