Preview missing lots of fonts that are shown in font book Clean almost untouched install of macOS Catalina 10.15.2.

I haven't installed any fonts yet.

Font book shows me fonts for example PSL Ornanong Pro. This font doesn't show up in Preview.

I would like to use this font in Preview.

How can I use all fonts from Preview?
PSL Ornanong Pro is 'available to download' in Catalina: it is not initially installed. Have you actually downloaded it?

Font Book will display the name dimmed slightly. You can download it by clicking on Edit &gt; Download, or Download on a right-click context menu.