I am using a 13-inch MacBook Pro (macOS Catalina) and a 15.6-inch Asus Zenscreen MB16ACM as an external screen.
System preferences gives me the following "Scaled Resolutions" for the Asus screen:

Resolution Frequency Aspect Ratio
1920 x 1080 60 Hz 16:9
1680 x 1050 60 Hz 16:10
1440 x 900 60 Hz 16:10
1280 x 1024 60 Hz 5:4
1280 x 960 60 Hz 4:3
1280 x 800 60 Hz 16:10
1280 x 720 60 Hz 16:9
1024 x 768 60 Hz 4:3
800 x 600 60 Hz 4:3
720 x 400 70 Hz 16:9
640 x 480 60 Hz 4:3

The only two usable resolutions are 1920 x 1080 and 1280 x 720. Problem with these are:
1920 x 1080 => super sharp but elements are too small.
1280 x 720 => elements have good size but everything appears blurry.

After some research, I came across a tool called SwitchResX which (in theory) should solve my issue. After switching off my SIP, I tried several custom resolutions including: 3360 x 1890, 2400 x 1350, 1680 x 945 of which none actually showed up in my display settings after rebooting. In SwitchResX-settings it only says in status column "Not active - invalid?".

Can someone recommend SwitchResX-Configurations for the Asus Zenscreen or another 15.6-inch screen?


1 Answer 1


The display is only capable of a maximum res of 1920x1080 [Full HD]. Nothing higher than that is going to work.
Your choices are tight & small or fuzzy & larger. That's it. You need a retina-type screen to sub-divide from higher resolutions.

  • 1
    I don't use Apple products but found this that should work: eizoglobal.com/support/compatibility/… The point being use only the native resolution but increment the scaling in order to have bigger icons/fonts. The same is applicable to Windows and any modern desktop Linux distro. Aug 21, 2021 at 15:11
  • @ChanganAuto Exactly what I need. Unfortunately, the Asus Zenscreen has not got HiDPI-Settings. If I use windows in a virtual machine I can just go ahead and change scaling to 125% at 1920 x 1080p which works excellent. Unfortunately macOS doesn´t offer the equivalent..
    – monty.py
    Aug 21, 2021 at 15:30
  • 1
    Mac has never had 'screen zoom' like Windows. tbh, the Windows implementation is awful & relies on a software interpolation that is very uncontrolled, but people apparently just got used to it for non-critical workflows. Apple refused to accept the compromise & poor interpolation that structure entails - preferring to keep their displays as crisp & detailed as possible for graphics/video work. Unfortunately, their current scaling implementation relies on the fact that all current Apple displays are Retina [HiDPI] & there is no compromise for a simple 'HD' display.
    – Tetsujin
    Aug 21, 2021 at 16:19

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