Since Workflow Maps are basically like any other process map, they are shown in the preview tab just alike. So the general functionality of the preview tab applies. However, there is an important difference: The workflow map interacts with an associated object in the listview. So you typically see the listview with objects (which should be on a workflow path) and then a corresponding workflow map in the right tab. The open workflow map tab listens to the currently selected object or document and then hands this over for interpretation to the workflow map.
Also, it is important to note that, if for a specific M-Files workflow there are multiple workflow process maps, then these workflow maps are offered for selection in a dropdown in the toolbar. This provides the ability to look at a workflow from different points of view or provide information on different levels of depth.
Since Workflow maps can contain symbols from all notations (BPMN, Flowchart, EPC, Portfolio) and since they can contain general functionality smart nodes that are dynamically filled with the data of the associated object, they can provide additional information and also allow to jump to other maps, create documents, etc.