Nikon CoolPix P7100 Reference Manual page 77

Option
Set the AF area mode for when the mode dial is set. The
AF area mode current focus area position is saved when AF area mode is set
to Manual.
Enable or disable the AF assist mode for when the mode dial is
AF assist
set. This setting is not applied to the setup menu settings.
E, F and N (User Setting Modes)
Description
A
E48
E78
59