Fork and join nodes in UML Designer activity diagram
UML Designer supports drawing UML activity diagrams. Join and fork nodes are horizontal bars by default: 
How can I make them vertical (flip them 90° or 270°)?
See the figure 12.95 at UML Superstructure v2.1.1:
Solution
I just figured out that UML Designer has an open feature request about this issue. So, currently...
How can I make them vertical (flip them 90° or 270°)?
... you can't.
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