How do I configure my system so that all GUI apps use a consistent DPI, without configuring each app individually?
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I don't have time to write a full answer.
However, https://wiki.archlinux.org/title/HiDPI explains most of it. There are multiple graphics frameworks (GTK, Qt, etc) that each have their own separate configuration. Xorg itself also has global DPI settings which the graphics frameworks may or may not inherit.
There are also certain apps that are just hopeless cases (they ignore all global settings) or must be configured individually through their CLI args etc, but that's probably out of scope for this question since it's asking for global configs.
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