The open-source licenses overview screen

To open the overview of the open-source licenses, click on the settings button and then on "View open-source licenses".

On that screen there's a back button to return to the settings dialog and an exhaustive list of the open-source libraries used by the app. Each list item lists the name of the library, the author, the library's version (if available) and the type of license the library is licensed under.

If you click on a library, a dialog with the license text opens. You can also long tap the list item (double tap and hold for TalkBack) for more information, like a link to the library's website.