Graphical Selection (Idle Mode)
In idle mode, entities can be selected from either the modeling window or the browser area. Selecting an entity in the modeling window automatically selects the corresponding entity in the browser and vice versa.
When working in a tool, entities should be selected from the modeling window.
Tip: In idle mode, convert your selection to a new
                        entity type by changing the entity selector. For example, if you select elements, and
                    then set the entity selector to nodes, all of the nodes
                    associated with the selected elements will be selected.