To investigate data flow paths that go through a specific object, click the object to pin it. Pinning an object highlights data flow paths going through it, so that you can focus on these specific paths, while other paths appear greyed out.
You can pin one or more flow points in one column at a time. To unpin a flow point, click it again.
When flow points are pinned, you can isolate all the flows that go through those objects. Isolating flows gives you a simplified view of the paths you want to focus on, while hiding all the paths that do not flow through the pinned objects.
To isolate flows, first pin one or more objects and then click Isolate Selected Flows. When you're done looking at the isolated flows, you can clear them by clicking Clear isolation.