I have somehow managed to configure my Mac to display dark borders around windows, toolbar buttons, and other UI elements, as you can see in the screenshots below:

All apps are now showing borders like this. How can I remove them?

有帮助吗?

解决方案

You have turned on ‘Increase contrast’ in settings.

Open System Preferences, search for ‘contrast’ and unselect ‘Increase contrast’:

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