Solved 4K Scaling Win10 Unreal 4.26.0 with Sharp Text and Sharp Demo FPS using alt + p
Before starting double check your settings and make sure these settings are changed first before applying the method.
Right click on the Unreal Engine “Shortcut”> Properties > Compatibility. UnCheck the box for “Override high DPI scaling behavior.” And yes, uncheck is correct for what we are going to do.
Open Unreal Engine > you may select a new project or current one you have > Click on Edit > Editor Preferences > Make sure “Enable High DPI Support” is Checked.
General > Performance > “Disable DPI Based Editor Viewport” is Checked.
Go ahead and Close Unreal.
Method Setup :
Right Click On Your Desktop and Select Display Settings
Left Click On Your 4K Monitor it should be labeled 1 or 2.
Scroll Down To “Scale and layout”
Click On The Drop Down Menu For “Change the size of text, apps, and other items”
Select 300% Recommended (My setup works with 300% which is the recommended yours might be different but use your own recommended.
Click on “Advanced scaling settings”
“Let Windows try to fix apps so they’re not blurry” Switch This To “OFF” and close the window.
Open Unreal Engine > Click on “Window” at the top left. Click on Developer Tools > Widget Reflector > Application Scale: Change from 1.0 to 0.8 and hit Enter.
Now your Windows apps will be correct size plus Unreal Engine will be correct size with non blurry text and also do alt + p for the FPS demo and that should be sharp as well.
I hope that helps some of yall. I thought something like this would be fixed by now.
-Matt