Windows 10 change display scaling via hotkey

Ok, so I couldn't find shortcut key because there is no such thing

however, since I need to develop stuff that should be supported in multiple resolutions I've found the quickest way to do that.

1. First, you need to extract the scales registry, run regedit and goto HKEY_CURRENT_USER\Control Panel\Desktop\PerMonitorSettings do that when the scales setting are set to 100%, let's save the 100% settings into a file named to100.reg

since there are different registry key per machine you have to export the registry for the machine you work on - I can't give you my files because it will not work.

2. Do that for all relevant scales - I've stored the 100%, 125%, 150%, 175% (on my windows 10 the DpiValue is 0 for 100%, 1 for 125% etc...)

3. create this batch (logoutToResolution.bat) file in the same folder of the .reg files:

@echo off
CHOICE /C ABCD /N /T 10 /D A /M "Log out to resolution: A:100%%, B:125%%, C:150%%, D:175%%"
IF ERRORLEVEL 1 SET RESOLUTION_FILE=to100.reg
IF ERRORLEVEL 2 SET RESOLUTION_FILE=to125.reg
IF ERRORLEVEL 3 SET RESOLUTION_FILE=to150.reg
IF ERRORLEVEL 4 SET RESOLUTION_FILE=to175.reg
REGEDIT.EXE  /S  "%~dp0%RESOLUTION_FILE%"
shutdown -l

4. Now, when running this batch file you need to choose A for 100%, B for 125% etc... after choosing the registry will get updated and windows will log out automatically.

5. you can create a different batch for every reg file if you want.

the logout is a must because if you don't log out the UI will be drawn differently than it should.