When you select a node, look in the Properties bar, there is a "Link mode" property for each output in a node.
Do mind that this feature helps a little bit with the general look of a flowchart when there are a lot of connections, but in my experience, it isn't a full proof solution, that is why it is not activated by default for all outputs.
I find it works well for the cases you end up with links that go over other nodes, if that is the case, it can help things look tidier. If the straight line links don't go over other nodes... it's probably best to leave them as is.