The Template Chooser supports three types of Libraries, «SharePoint Online» libraries, Teams libraries, OneDrive and OneDrive for Business Libraries and «Samples» libraries.

Switching between libraries (1)

Template Chooser Setup SharePoint Online

To switch a library just click on the name of the existing library (1) at the top of the Add-In. That will bring up a list of all available libraries for you to choose form. You can then just click on one of the libraries to switch.