Users should expect to use Advanced Settings (aka Gnome Tweak Tool) to change the Shell theme. If I hover the mouse over the warning triangle you see in the attached image, I get the message 'Shell user-theme extension not enabled'. Also notice from the image that no shell theme is available in the list.
Created attachment 1723 [details] image
Oops, perhaps this issue will disappear when Bug 4737 and Bug 4523 will be fixed. If so, please apologize for the noise and close this bug as a duplicate.
Why assign to me? I'm not the gnome-tweak-tool maintainer. Not enough time to handle every Mageia GNOME bug. *** This bug has been marked as a duplicate of bug 4523 ***
Status: NEW => RESOLVEDResolution: (none) => DUPLICATE