The HiDPI toggle in Garuda Welcome on a KDE installation will be more functional with regards to the login screen when the following is added (presumed that sddm is being used as the display manager):
/etc/sddm.conf.d/hidpi.conf
[Wayland]
EnableHiDPI=true
[X11]
EnableHiDPI=true
See [here](https://wiki.archlinux.org/index.php/SDDM#hidpi)
As well as this:
/etc/sddm.conf
X11 section:
ServerArguments=-nolisten tcp -dpi 192
See [here](https://github.com/sddm/sddm/blob/develop/README.md#custom-dpi)
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Enable hidpi = true
Is enabled in sddm already
As for dpi value setting it will only trouble non hidpi screen
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My login screen was unreadable, so therefor the suggestion
You can make a pull request with the changes that you see fit
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I'm not sure about the git request-pull procedure as I've never done this.
As far as the DPI value settings is concerned, it is the user who will request this setting in the Garuda Welcome App, tab Settings, so this should not be a problem on non HiDPI screen.
Ohh right 
User will enable hidpi
So yeah its possible to do this.
As for the gitlab i have given you maintainer acceess
So you can just
git clone the garuda welcome repo
Then make the changes
And
git add .
git commit -m "commit message"
git push
I made some changes to hidpi script
Hope these work.
It now asks for the screen dpi as input
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