The dependencies control lets you navigate to process models which use the current model and which are used by the current model.
The current model is shown in the center of the control.
Elements which use the current model are listed on the left. Elements that are used by the current model are listed on the right side.
To navigate through the dependencies simply click on the desired element in the control or double click on the element in the diagram.
You may also select the element in the diagram with a single click and choose between simply opening the referenced diagram or opening it in a new tab in the toolbar that appears.
In the breadcrumb bar at the bottom left of the diagram window you can see the folder path. If you want to navigate to one of the elements, you can simply click on it in the bar.
If views are maintained, they are also displayed in this bar and can be selected in the same way.