This characteristic is set by the Double-sided Badges menu option. Each time it is changed the database is updated to reflect the current state. To make a database single-sided make sure the configuration menu item is not checked. The user must have the required security level to change this characteristic.
Displaying a database without double-sided enabled will not cause any information to be lost about the reverse side of the badge. The information simply will not be available for display or printing. When double-sided is turned back on the information will again become available.