Pop-up menus are displayed when there are several options from which to choose. When the pop-up menu appears, the mouse cursor is centered in the menu and the menu is made active.
Some pop-ups are displayed with a border around the menu box and some have no border. If the pop-up menu has a border, you must make a selection before you can proceed. If the pop-up does not have a border, you can either select a menu item on the pop-up menu or move the mouse outside the bounds of the menu.
Some pop-up menus allow multiple selections. In such cases, the pop-up menu remains on the screen until you move the mouse outside the bounds of the box.