Dark Theme for [Qubes Manager] Not Working in 4.1

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In dom0:

$ sudo qubes-dom0-update qt5ct qt5-qtstyleplugins

Then, run:

$ export QT_QPA_PLATFORMTHEME=qt5ct

Then:

$ qt5ct

Here you select Style: gtk2 (to match your current XFCE settings) and you can select also Fonts and Icon Theme.

Only QT_QPA_PLATFORMTHEME=qt5ct needs to be made persistent.

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