When adding themes in 'Settings > Global Themes' you cannot delete themes you installed via this GUI. When looking at an idividual theme there should be a "Trash Can" icon on the given theme so that you can delete it. There is no "Trash Can" on this current release. KDE NEON Plasma version: 5.20.2 KDE Frameworks Version: 5.75.0 QT version: 5.15.0 Kernel Version: 5.4.0-52-generic
Created attachment 133037 [details] Screenshot of the cursor highlighting a Theme without the 'Trash Can' option to delete/uninstall.
*** This bug has been marked as a duplicate of bug 391905 ***
Created attachment 133059 [details] No "Remove" or "Trash can" icon to delete/remove installed Themes.