On my Mac, I am using Mac OS X Catalina, and I would like to change the system font to something other than San Francisco. I tried TinkerTool but it doesn’t really work.

  • MacOS does not really lend itself to customizations of this kind. The system is now completely 'sealed off' from modification. While it is possible to boot to Recovery or another volume, disable SIP, and perform the necessary alteration, you will have to do this every time there's a system update (so, every 2 months on average). – benwiggy Dec 2 at 9:40

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