Source (link to git-repo or to original if based on someone elses unmodified work): https://github.com/vfosterm/nixos-sddm-theme-noBlur.git
A fork of NixOS login theme - removes Blur
Original here - https://www.opendesktop.org/p/1214121
All credits to MARIANARLT for the beautiful theme
Install and download with SDDM login manager. (make sure to have sddm-kcm installed)
or unzip nixOS folder to /usr/share/sddm/themes/
or if you already have the original NixOS installed you can just replace the edited Background.qml with mine on github. It is the only file I have altered.