Switch between List and Column views

Press L to show a level of your outline as a List or as Columns. You can also click the view icon at the top of the column.
L shows the top level as columns: the next column lists what is inside the selected item. L again goes back to the list.
List View
Sub-items are indented under their parent. Best for writing and editing.
Column View
Each level gets its own column. Best for finding your way around a large outline.
Keyboard Shortcuts
Press L to switch between List and Column view.
Your selected view is remembered the next time you open that column.