Question regarding subflow

[Trying_to_learn]

When editing the subflow, in the top left there is an edit properties button.

Click there and you get options to edit stuff about the subflow like the properties of the subflow and entering a description.

Update:

Sorry. I am wrong with what I said.
But that does give you information if you have the help active (right side of the window looks like a book) and you click on the sub-flow in the list.