Scaling external Display on Macbook Pro Mid 2012

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I have a Macbook Pro Mid 2012 and I use it together with a Dell 24" Monitor, which has 2.560 x 1.440 pixels (WQHD).

When I use this monitor together with my Windows PC, I'm using a scaling of 125% to increase everything (e.g. GUI elements, font, etc.) to a proper size. Screenshot of the corresponding options in settings:

Screenshot of the settings on Windows

Unfortunately there doesn't seem to be an equivalent setting option on my Macbook. All I can do is to change the output resolution for the external display. When I choose the native resolution 2560 x 1440 everything is of course quite small. When I choose for example 1080p everything has a proper size for me, but it is blurry.

Is there any possibility to have something like "windows scaling" on my MacBook Pro Mid 2012, or is there any 3rd party App which adds this functionality?

enter image description here

I'm looking for something like this for external displays on my MacBook:
![enter image description here

UPDATE 16.05.18
available resolutions via RDM
enter image description here

Best Answer

You're best off using Mini DisplayPort to DisplayPort cable for this. HDMI would work but you'd need to make sure your mDP to HDMI adapter and HDMI cable were compliant. It's just easier to buy one mDP to DP cable.

The easiest way is to hold Alt when you click on the Scaled option, which will force macOS to show the additional scaled resolutions in the list.

Here's Displays for my Apple Cinema HD Display as standard: enter image description here

And then after Alt-clicking the Scaled option: enter image description here

Alternatively, you can use a menu bar app called RDM (download link at bottom of readme) which lists all available resolutions, with retina resolutions marked by the ⚡️ lightning bolt emoji:

enter image description here

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