Changing the GNOME App Theme outside of GNOME

I am using a windowmanager but also have installed GNOME on my system.
I want to change the system theme on the fly with shell commands. For
that i use xfsettingsd to switch from “Adwaita” to “Adwaita-dark” and
vice versa.
This works for Firefox, LibreOffice and other Applications, but does not
seem to effect GNOME Apps like Evince.

How can I change the GTK Theme for all my GNOME Apps without running


Have a look at this: bash - how to set icons and theme from terminal? - Ask Ubuntu

Additional advice: try to search for your problem before posting a question on place like this, since it will take time for people to answer you.

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