With Redtail's Calendar, you have the option to set your default view as either a Day, Week or Month view. You can always change your view when actually looking at your Calendar, but most likely you have a view that you would prefer to be your default view.
To set your default Calendar view, go to your Preferences page:
The second section you'll see on your Preferences page is Activity Management:
Click inside the Default Calendar View box to select from your available options:
After selecting Day, Week or Month, click Save Preferences in the upper right hand corner of the Activity Management section and you will have successfully changed your Default Calendar View.