To change the View in the Calendar Manager window so that is displays appointments for a month, choose View -> Month.
Alternatively, from the Month view, place the pointer over the number for an individual day and click SELECT to change the view to the week containing that day. Make sure to click SELECT directly on the number of the day within Month view. Clicking SELECT anywhere else on the day just selects that day. When you click SELECT directly on the number of a day, the entire week containing that day is highlighted when the SELECT button is down, and the view changes to the Week view when the SELECT button is released.
You can also display a monthly list of Appointments or To Do items. See "Appointment List and To Do List Views" for more information.