Resize partitions in loop node

[chulbe1]

I am using a Loop Node structured activity on a UML activity diagram in EA 9.3.922 that has 3 partitions: setup, test, and body. Setup has 1 action element, test has 1 decision element, but the body has 5 action elements that have pins so they are a little large. I resized by loop node, but that resizes all partitions to be equal size. I try to drag the dashed line (it shows a grayed out line when moving), but when lifting the mouse it does not change size. Is there a way to make the setup and test partitions smaller than the body partition?