Type to scroll
The Typeface grid allows you to type a letter to jump to fonts starting with that letter. For example press the g key on you keyboard to jump to fonts starting with a ‘g’. This allows you to quickly scroll through your library and find the font you need.
To jump to a specific font just keep typing. Multiple letters typed in succession will jump to fonts starting with your typed prefix. For example type helv in the grid to jump to Helvetica. When you start typing again after a small delay the app jumps to fonts starting with that new prefix.