Weekly Combined Calendar
To view the calendar in Week, Month or Agenda format, click on the desired view in the upper right corner of the calendar. To change the viewed time frame, click on the arrows in the upper left corner of the calendar.
Open all three in Google Calendar: click the gray arrow that appears by hovering in the upper right corner of calendar.
Once Google Calendar opens, the calendars may be toggled to be hidden or revealed by clicking on the blue drop down arrow in the upper right corner.