Moving between Subdiagrams
To scroll through the available subdiagrams, click the decrement and increment arrows in the Case, Event, Stacked Sequence, Conditional Disable, or Diagram Disable structure selector label.
(Windows) You also can move the cursor over the selector label and press the <Ctrl> key while moving the mouse wheel. (Linux) Press the <Meta> key.
To move to a specific subdiagram, click the down arrow next to the case or frame name and select the subdiagram from the shortcut menu. You also can right-click the structure border and select Show Case (or Frame) and the case or frame label from the shortcut menu.