Restore fonts that came with your Mac using Font Book
You can restore the fonts that were originally included with your Mac. This may be useful if you’re having issues with Font Book. Restoring the standard fonts moves any fonts you’ve installed into a separate folder, which makes them unavailable to use in apps.
In the Font Book app on your Mac, choose File > Restore Standard Fonts.
Any fonts you’ve installed are placed in /Library/Fonts (Removed) or in ~/Library/Fonts (Removed). To use those fonts again, just reinstall them.