North American Overlay Mapping
Click 'Tools' > 'Pin Clear' to access this tool. Its function is to clear currently selected Map-Pins, and to erase currently displayed graphics.
When the tool is started, it tells you how many pins are currently selected, and offers a choice of what exactly you wish to clear: pins, graphics, or both.
Choose which you want using the three radio-selector buttons, then click the 'Clear' button. The action will be performed, and the tool-box will close automatically.