Can't get two displays to sync in Mac mini running macOS Sonoma

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Level 1

21 points

Can't get two displays to sync in Mac mini running macOS Sonoma

Mac Mini 2018, Macos Sonoma.

Using two displays. No problems. Until a couple of days ago.

I then, out of curiosity, tested a few different resolution options. Then this happened. See image.

The screens are same brand and model, bought at the same time. The settings both IN the screens and in system settings are the same. I also use the app BetterDisplay, and the settings there are also identical. Still, the "sync" fails.

Have tested individual and different resolutions on both as it seems as if the left has a lower and the right a higher.

Still no go.

Anyone?

[Re-Titled by Moderator]

Original Title: Can't get two displays to sync

Mac mini, macOS 14.7

Posted on Jun 6, 2025 11:25 PM

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Answer 1

Danne_V Author

Level 1

21 points

Jun 7, 2025 10:14 AM in response to Danne_V

SOLVED!!!

Turned off the app BetterDisplay (which actually is pretty good!), rebooted, and tested various settings, i.e. shifting both from "Extended display" to "main display" and vice versa a couple of times and eventually made content line up vertically between the displays.

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Answer 2

Jun 8, 2025 7:02 AM in response to Danne_V

You have the displays to extend instead of mirroring (which I suppose is what you meant by "sync"). Change that in System Settings->Displays.

Furthermore, you have "Displays have separate Spaces" turned OFF (in System Settings->Desktop & Dock), which may or may not be what you want; if you want to change that, be aware that for the change to be applied, you need to restart your mac after toggling it on or off.

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Answer 3

Jun 8, 2025 7:04 AM in response to Luis Sequeira1

Sorry, for some reason your second post was not visible when I wrote before. Anyway, it's great that you got it resolved. BetterDisplay is fine, and adds further possibilities, but is not necessary (nor was it to blame, it was a matter of using the desired settings).

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