View the background picture at full visibility.
Click the Background Visibility button on the toolbar, then choose Background On in the pop-up menu.
Control–click and choose Background Visibility > Background On.
Choose View > Background Visibility > Background On.
Hide the background picture.
Click the Background Visibility button on the toolbar, then choose Background Off in the pop-up menu.
Control–click and choose Background Visibility > Background Off.
Choose View > Background Visibility > Background Off.