I have installed KDE Neon User Edition 5.21 but in the System Preferences - Workspace Behavior - Desktop Effects - Desktop Cube section - cannot change the background to a custom one in the Desktop Cube, the box for mark it as an option and put some own wallpaper in the background.
Do you know in which part are the configuration files of this part to be able to configure them
I leave a screenshot of the configuration window where the box to check it does not appear.


https://imgur.com/nH7PiXO

As far as I know it's a known bug:

https://bugs.kde.org/show_bug.cgi?id=430874

At top left of Advanced tab (check Display image on Caps) and replace the image of the caps of the cube here
/usr/share/kwin/cubecap.png
Poor consolation.
OS: KDE neon Testing Edition x86_64
Kernel: 5.4.0-73-generic

Thanks for your reply
The bug to change and customize the skydome has been reported since 2020-12-28
Why haven't they corrected it?