Scale < 100% on Windows 10

I would like to set my monitor's scale under 100%, but Win10 only lets me set it to 100% or higher. Why won't Windows let me do that? Is there any workaround to do that? I am aware of the fact that scaling below 100% will result in merged pixels.

You must use a registry hack to get scaling values below 100%:

Open the Registry, navigate to HKCU\Control Panel\Desktop, and double-click on LogPixels to edit. If there is no LogPixels, create a new DWORD value and name it LogPixels.

Make sure the Base is set to Decimal.

The default value is 96, as in 96 dots-per-inch, which is "100% scaling". Values lower than that will be sub-100% scaling values.

Next, in that same Key, find Win8DpiScaling. It it doesn't exist, make another DWORD value and name it Win8DpiScaling. Then edit it as follows:

If the value of LogPixels is 96, then Win8DpiScaling should be 0. If the value of LogPixels is anything besides 96, the Win8DpiScaling value should be 1.

More information: https://www.tenforums.com/tutorials/5990-change-dpi-scaling-level-displays-windows-10-a.html