Relation Library

Select the tab at the top center of the page to view Relations.

The Relations Library is organized the same as with Types, but your icons are a bit different.
Clicking on a Relation here will give you the choice to install to your Library.
To Create a New Relation, enter a title in the search bar, & select "+ Create Relation".
The My Relations tab is where you can access all installed Relations in your Anytype.
Clicking on a specific Relation will open a Set View of all Objects utilizing that Relation.