I would like to know how to install a theme that I downloaded from this site... https://www.xfce-look.org/p/1210504/
Installation:
1. Unzip and copy the "Mantis", "Mantis Dusk" & "Mantis Night" folders in to your "~/.themes/" directory.
2. Open Xfce Appearance settings and select the theme.
3. Open Xfce Window Manager settings and select the theme.
The icon set in the first image is ePapirus, and Breeze in the second one.
Thank you for the reply.. Of course when looking for the ~/.themes directory it says "No such file or directory".The how to is described on the site you linked:
..., but the window borders remained the same as the old theme.