Set different DPI scaling values for extra monitors attached to a laptop, while keeping the laptop's. Requires "SetDPI" (see link below)

SetDpiValues.bat

@echo off

@REM path to SetDPI.exe (get from https://github.com/imniko/SetDPI)
set SETDPI_PATH="C:\ProgramData\SetDpi"

@REM How many screens connected?

for /f "delims=" %%a in ('powershell -Command "$m = Get-PnpDevice -Class Monitor -Status OK | measure; $m.Count"') do set "MONITOR_COUNT=%%a"
echo Monitor count : %MONITOR_COUNT%

for /l %%i in (2, 1, %MONITOR_COUNT%) do (
	echo Monitor %%i set to scaling 100
	start "" "%SETDPI_PATH%\SetDpi.exe" "100" "%%i"
)

@REM Show for 10 seconds
@timeout /t 10