Display scaling is broken in login manager
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Please take this opportunity to fully explain your issue, and provide supporting information.
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How can you know?
Your profile says
DE / WM: Plasma 5.19.4
I assume this is simply not up-to-date.
Assuming you are using Plasma - sddm was never good at display scaling - you had to enable hidpi in the configuration, to achieve a reasonable size of the login screen in high resolution displays.
Do you use another display manager than default sddm?
If yes - which one?
Your profile also says
GPU: NVIDIA GeForce GTX 1660 SUPER
You may run into issues with old Nvidia GPU no longer supported in latest 590.xx driver version.