There you can create a new board.
Type a board name, add a description (optionally), and click lists picker to select SharePoint list(s) from the site collection, which contain the data you will display on the Kanban board.
List picker allows you to select several lists with the same content type to display on Kanban board. The dropdown menu contains the current site collection’s sites and subsites.
Available Content Types dropdown allows you to select the lists containing the chosen content type.
Search field allows you to filter lists by name, according to a specified parameter.
If you have to select multiple lists, choose the required content type in dropdown menu. All lists from the selected site/subsite with this content type will be available to select.
You can select several lists with the same content type to display on Kanban Board.
The list name contains link to this list, and you can also see the list collection where this list belongs to.
Click “Next step”, if you have selected all required lists.