The plugin can be accessed from the Customizer inside the tab The Typography. It can also be accessed from any Block editor’s The Typography sidebar (top right corner of the editor). Create a typography and modify its’ options; create a group of selectors and inside it assign CSS or Block selectors.
If you want to preview the different fonts before selecting one you can preview them in the Google Fonts repository.
The typography editing is assigned to the
edit_theme_options capability. This means that, by default, only admin and super admin will be able to use the features.