The story engine tabs control which of the four 'panes' are viewed in the story engine window.  They four panes are:

•Master - An overview of fifty-six story points

•Classic - The story engine story points as found in Dramatica Pro 4.x.

•Character - Story points found in the Setup Main and Impact... window in Dramatica Pro 4.x.

•Signposts -- A place to assign signpost (act) order.

Click on the tab to move to that pane.