I reinstalled the build from February 20, 2022, and modified slightly Prof-Gnome - redefined only base_bg_color theme_base_color menu_bg_color sidebar_bg_color to white and is much more bearable.
I never noticed this myself but yes, `base_bg_color` and `theme_base_color` should be white. I've just updated the Prof-Gnome theme with this change.
I don't know if you noticed but two days ago I made some changes where I made the checkboxes and radio buttons a bit smaller to better match Windows and macOS and also changed `menu_bg_color` and `sidebar_bg_color` to the same gray color which is used by other widgets - at least on macOS menus are gray. Are they white on Windows 11?
Why are the notebook tabs different size?
I suspect it might be something with the order theme files are loaded and when `geany.css` (Tools->Configuration files->geny.css) is loaded and whether it overrides the theme correctly. To me it appears that the 0 padding of `geany-close-tab-button` isn't used when the theme is in AppData.