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Under your 4K display, turn on "Edit the system configuration of this display model", then check "smooth scaling" and "add near-native hiDPI resolution", then apply the settings on the left, and pick whatever display resolution you want (or slide the Display Mode slider), and it will scale your display properly, giving you pin-sharp text at ...
Check Show scroll bars option When scrolling, so you can get rid of that static Scroll bar that is displayed constantly on your right hand side. Now the Scroll bar will appear exclusively just when scrolling.
You can check to make sure your monitor is displaying its full 1440p resolution in Mac by comparing it to a Windows screenshot. In Windows, take a screenshot about a 1/4 of the screen and include your ugly document text with other text like a web browser and desktop/menu items.
A 27" 1440p display will only look right running at its native resolution. If you scale it to look like some other resolution there are not enough pixels to render things sharply. So just run it at 1440p and increase your font sizes in Finder, Word, etc. if you find text too small to read.
If you don't like macOS at 200% (objects are too big or too small), then you'd have to force the system to render whole UI at a different-than-your-screen resolution, and then macOS will fit that image to your screen.
It basically use larger/higher-resolution assets (2x) while rendering your whole screen in pixel double (so, if you choose "looks like 2560x1440" it will render your screen in 5120x2880 before pumping it to your 3840x2160 screen).
3 kwi 2014 · Quick guide to enable correct color mode and 125% scaling on external Dell 4K (2650 x 1440) monitors with your MacBook. (Instructions for Windows and OSX). This gives you a smoothly scaled...
