Hello. This is what my login screen looks like. The username and password field has moved to the left. I’ve tried installing different themes from the app, but nothing changes. How can this be solved?
Hi 
Plasma by default comes with SDDM. The one you show in image is LightDM Slick Greeter.
Did you install something which pulled in LightDM?
I have lightdm-gtk-greet installed
I solved the problem. Thank you