If you have a map with many phases and a lot of cards, it can sometimes be difficult to get the overview. Here is a tip on how to create dividers vertically, to make the phases in a map more visible: 

Move your cursor into the gap between your top row and the grey top border until the small column menu appears. Then choose "insert column". That way you can create a vertical column in your map. 

You can also easily remove a column this way, by choosing "remove column" Just make sure the column you want to remove doesn't have any single-column cards or curve points. (Wider cards will shrink when you remove the column.)