I don't trust "modes" - even in my F-75. And none of the icons in any detector. They'd need a thousand different icons for all the buried bits in the soil. Hang around on the "What Is It?" forum to see what is out there.
The presets and modes adjust the parameters to respond to typical coin sizes, shapes, and compositions. Old bronze Flying-Eagle and IH Cents, small fractional silvers, and other non-standard coins are outside those parameters. I like to search with no mask or notch and just a hair of iron discrimination and see what the TDI says.