10 items name of, mark, Enable / Disable, you can set the display / hide.
If it's used, but the hidden, it can ON / OFF this item in the input screen, calendar, the graph screen is not displayed.
Also use only in item 1 period, it is not possible to change the display. Also, since the calculation of the period cycle in item 1 it must not be to manage during menstruation in the other items.