The new font options include Canela (16 styles), Domaine (6 styles), Founders Grotesk (17 styles), Graphik (18 styles), Produkt (8 styles), Proxima Nova (12 styles), Publico, Sauber Script, and Quotes Caps. Alternately, click the Download button in the font preview window. Fonts that are disabled show Off next to the font name in Font Book. The font remains installed, but no longer appears in the font menus of your apps. Select the font in Font Book, then choose Edit > Disable. Disable fonts You can disable any font that isn't required by your Mac.

Right-click (or Ctrl-click) the selected font and choose Download from the contextual menu. To download the font, select it and choose Edit > Download.

The grey indicates they're either deactivated or haven't been downloaded yet.

Browse the font list and select any greyed out fonts you like the look of.

To view and install the optional fonts, follow these steps. Reported by Typography.Guru, the new system fonts were licensed from type foundries including Commercial Type, Klim Type Foundry and Mark Simonson Studio.

The Apple operating system installs all fonts via the Font Book app. But given they're an optional download, you might not even be aware that you can access them for free. Sources for downloading fonts for Windows or Mac.

Apple recently bought licenses for several new fonts in macOS Catalina.

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