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Moving Displays On X11 Means Reconfiguring Everything?
(sh.itjust.works)
Just change your laptop res to 1920x1080, to get the screen DPIs closer. Fun fact: you don't have to run displays at the highest resolution.
(you said your laptop is 3840x1080, but I assume you meant 3840x2160)
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian provides more than a pure OS: it comes with over 59000 packages, precompiled software bundled up in a nice format for easy installation on your machine.