Gthumb light theme?

I’m using gthumb 3.12.3-1. But the whole user interface is dark.
I think there has been an option to change the theme (in settings - extensions) but it is gone.
All my other apps have a light theme.
How to get a light theme in gthumb?

The Gtk 3 theme is set under Tweaks > Appearance > Legacy Applications.

Thank you! Unfortunately not all themes with light in their names change the gthumb ui to light.
But some do, thats ok for now.

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