@Sagorath Click the little slider bars at the top right of each column. You can unpin and pin columns to make them go away or appear. To add a new column that is int he top left.
@freemo getting started has no slide bar
@Sagorath The column all the way to your right is a dynamic column. It changes as you select different things from the buttons on the upper left.. You can't pin getting started but you can pin all the other types of timelines.