Use the options on the Preferences>Calendar tab as follows. Be sure to click Save to save any changes you make to your preferences.
Default View. Select how you would like to view your ETCMail calendar. The default is by work week. The view options include: Day, Work Week, 7 Day Week, Month, and Schedule.
Start Week On. Specify which day of the week should be the first day of the week in your calendar.
Always show the mini-calendar. Specify whether the mini-calendar is displayed at the bottom of the Overview pane.
After responding to an invitation. Specify whether to automatically delete invitations from your Inbox after you respond to them.
Show reminders. Set the number of minutes before an appointment to be reminded. The default is five minutes.
Use the QuickAdd dialog when creating new appointments. Specify whether to create new appointments using the QuickAdd dialog. This is often helpful if you create many appointments without attendees.
Show time zone list in appointment view. Select if you often schedule meetings with other in different time zones.
Permissions. You can specify specific users who can see your Free/Busy information and can invite you to meetings. The default is to allow all users to invite you to a meeting.
Import/Export. Import and export iCalendars. See Importing iCalendars and Exporting your iCal calendar.