I managed to solve it, don't know how to remove this post
Hope someone can help me.
Fairly new to Sparky still.
Running the latest Sparky XCFE edition the Sparky rolling edition.
I would like to have a nice dark theme, but I cannot find it, at least I cannot get it working
Found the folowing site on the Internet: https://www.maketecheasier.com/xfce4-desktop-themes-linux/
Tried the PRO-Dark-XFCE-Edition, cannot get it to work (it sees it, but it doesn't do anything)
Tried the XFCE Simple Dark edition also not working. The Window manager doesn't even detect it.
Managed to solve it, don't know how to remove it.