Download NIRCMD ► https://www.nirsoft.net/utils/nircmd....
Create a batch file and add this into it:
nircmd.exe setdisplay 3840 2160 32
Move shortcut to this path (so that the keyboard shortcut will work even after restarting Windows):
%ProgramData%\Microsoft\Windows\Start Menu\Programs
A more simple alternative is ► HRC – HotKey Resolution Changer
https://funk.eu/hrc/
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