By default, rulers will be shown along the top and left side of the Label View. Rulers can be removed by using the Show Rulers command from the View menu. Selecting Show Rulers will activate the Label Window rulers if they are not currently being displayed. The units displayed on the Label Window rulers can be changed using the Ruler Settings... command from the Edit menu. Dragging to Ruler Settings... activates a submenu. Drag to the desired setting displayed in this submenu and release. You can also toggle through the available display units by clicking on the intersection between the rulers in the upper left corner of the Label Window.