This is an old revision of the document!
When viewing Planned Flights section, Leon will inform you if there has been any crew change done on the flight. Moreover, when you hover the mouse over the belt, a pop-up window will show up with the information about the previous and the actual crew.
The only requirement from you is to have a checkbox 'Show crew change' ticked in the filter.
Below you can see examples of how this feature works: