Set Calendar Suite Preferences

In the Administrative Client, under the Calendar Suite tab, you'll find Manage Preferences.  Click there and examine the options.   They are:

1. Preferred view.  You can change if from All to one of your other views. 
2. Preferred view period.   Busy sites often change this to day to keep the list of events from growing too long.
3. Default Categories.  You can hide unused categories here.
4. Preferred time type.  AM/PM or 24 hour time.
5. Preferred end date/time type:  This controls the default behavior when creating events.   After the start time is entered, either an event duration field or an time/date end time field is presented to the user.  The user can also switch to the non-default behavior at event creation time.
6. Default timezone:  Set your time zone here.