This is a sample and simple C++ console project to change windows Scale and Layout aka DPI scaling from command line paremeters. It can work on single and multi-monitor setup.

How to use

It takes up to 2 parameters, first being the monitor ID, which you get from windows display settings, if you click identify it shows you the no.

SetDPI.exe [monitor no] [DPI scale value]

To set 2nd monitor to a scale value of 250,

SetDPI.exe 2 250

If you have only one monitor or want only main monitor to change you can omit the first parameter, so

SetDPI.exe 150

would set the first or main monitor to 150 scale.

Release

Get the release build and a sample ahk script with hotkey example from here https://github.com/imniko/SetDPI/releases/

Credits

The whole credits goes to @lihas of this project, https://github.com/lihas/windows-DPI-scaling-sample it was not possible without his findings.