Change Font Book settings on Mac
Use Font Book settings to change options for where fonts are installed and how duplicates are handled. To change these settings in the Font Book app on your Mac, choose Font Book > Settings.
Show Waterfall Sample
Show a line of sample text at multiple font sizes when you preview a font.
Resolve duplicates by moving files to the Trash when possible
Choose whether to move inactive copies of duplicate fonts to the Trash.
Show these items in the sidebar
Select the fonts, languages, or scripts you want to see in the sidebar.
Default install location
Choose where to install fonts:
System fonts you download from Apple aren’t installed in these locations.
Restore the fonts that were originally included with your Mac and move any fonts you’ve installed to a separate folder.
Afterward, to use any fonts that have been uninstalled, just reinstall them.
Show Moved Fonts
View any fonts that were moved after a font reset.
Show fonts managed by non-Apple utilities
Show fonts that were installed by third-party apps.
In some apps, such as Mail and TextEdit, you can select a font to use as the default in the app. For more information, search the built-in help for the app. For help using fonts in third-party apps, such as Microsoft Word, check with the developer. See the Apple Support article Contact a third-party vendor.