Add a draggable point right in the middle of a sequence flow between microflow activities.
This new point will act like if you change the ‘Destination and origin bezier vector’ of the sequence flow exactly the same.
And with modifier keys (ctrl/shift/alt) there are even more possibilities, like only horizontal/vertical change.
For example, if you make a flow like this:
and you easily want to change the ‘false’ flow to this: