Change Only DPI Scaling of SDDM

How do I change only the DPI scaling of the SDDM login screen on KDE Plasma 6.6.5? I know that ‘Apply Plasma Settings’ already applies my desktop’s DPI scaling, but what I want is to apply one that is different from my desktop to my SDDM. For example, my desktop runs at 125% scaling, while I want to set my login screen to 100%. How do I do this?

Set it to 100%, then ‘Apply Plasma Settings’ and after that set it back to 125% (without touching ‘Apply Plasma Settings’ again) does not work?
For example I have disabled HDR on SDDM (as I think HDR there makes no sense) and in the past even set one Monitor to a different resolution with that method successfully, not tried different DPI though.

Oh, thank you! I didn’t think of that.