Before the update, you could drag the last item in a Journey down, off the bottom of the editing window, then let go of the mouse button and the item would be moved a significant distance further down the screen. This gave you more space in the Journey to insert new items. It wasn't a great system but it worked.

Since the update, when you let go of the mouse button when the last item is off the bottom of the editing screen, nothing happens. When you bring the mouse back up into the editing screen the last item comes with it. It hasn't been 'dropped' further down. So all you can do is expand the Journey a couple of millimetres at a time.