The Fragments panel is located on the bottom left part of the screen, along side Objects and Validation panel. This is where you can see and use fragments created by you or any other user.
Fragments panel overview
The Fragments panel gives you an option to drag&drop fragments that are currently available for the type of a model that you selected. They consist of two or more selected objects created as a fragment.
The Option how to create a fragment will be explained in the Canvas section.