By default, the subtopics in the Outline View are sorted in the order they are linked to a parent topic. If you have re-arranged the ideas in your diagram, you can use the DiagramSync feature to resort your Outline at any time, by pressing:
Sorting will be calculated at each topic/ subtopic level, using one of 3 rules. A diagram can have a mixture of layouts.
Web arrangement with subtopics circling around a symbol
Going in a clockwise direction around a symbol, the order of priority starts with the subtopic position at or closest after the 1 o'clock position.
Top/ Down Tree arrangement
Priority is given to the subtopic on the far left, moving through to the far right on the horizontal link line.
Left/ Right Tree arrangement
Priority is given to the subtopic positioned at the top, moving through to the subtopic positioned at the bottom on the vertical link line.