https://store.kde.org/browse/cat/101/order/latest/ 

And probably more relevant to you, https://wiki.archlinux.org/index.php/SDDM#Theme_settings 

On Tue, Aug 4, 2020 at 1:58 AM Jim via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
I figured out how to set the background image I wanted for SDDM. The
only problem is this big circle right in the middle for the user's
avatar.  I got rid of the default avatar by creating a transparent image
and setting that as the avatar.  That only leaves a gray circle right in
the middle of the screen.

Here it is. https://ibb.co/9GMLvLN

Is there any way to get rid of it?  I've got Kubuntu 20.04.

thanks

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