The Occurrences panel shows you where the selected object or relation is located, in case there is more than one occurrence. If there is only one occurrence of that object, you will see only one model in that panel.

The bold name indicates the selected occurrence in the model. All occurrences in the actual selected model are highlighted.

Clicking on one of the occurrences of the selected object or relation will automatically open the model on which the selected object or relation is located on the canvas. The window will be positioned so that the selected object or model is displayed.