I want to install Qogir theme on Xfce (I'm using Debian).
I've downloaded and extracted the files in the ~/.local/themes directory, then went to Appearance and selected Qogir in the list of "styles" (sorry if the words doesn't match precisely since my interface is in french). I've also chosen Qogir for the window theme (the "decorations"). This works, as well as the icons I've downloaded. However the content of the windows doesn't change, and instead of looking very Qogir flat design, it's looking like really old design. I've read that Xfce is using GTK2 for the rendering of some applications, and I've read in the Xfce doc that :
A GTK+ theme is the theme of the toolkit (buttons, textfields, etc). Most of the GTK+ themes need their own theme engine, make sure you have that theme engine installed with the same prefix as the GTK+ toolkit.
So I installed the engines with apt, and nothing changed but I guess that's normal since the doc says the engine should have the same prefix as the GTK+ toolkit. My questions are : what exactly is the GTK+ toolkit ? It that my Qogir theme ? How can I find those installed GTK2 engines to modify their prefix ? And... how can I modify the prefixes ?
Thanks a lot for your help!