It sounds like you messed up the key binding for the enter key and fingerprint scanner. Boot to a live CD, mount your partition, chroot into the OS, delete your changes to whatever file that process you ran uses. You can try just deleting the file and reinstalling defaults if you can find a command that reinitializes it!.
If startx and everything else works fine, my guess is that sddm or whatever login manager you're using is messed up. Maybe reinstall/reset its configuration files and go from there.
It's not bad, but personally I prefer to keep my task bar separate and horizontal, which I don't think would work with this. Plus my ultra-wide would make it more work to reach than the top and bottom.
I'd post my desktop but it's been getting so buggy lately. Task bar flickering, widgets getting squished. But I can't even look into those yet because I'm trying to figure out why my desktop sessions aren't being saved or restored anymore. Is this just life using Tumbleweed?
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