show category list by default, the category pick list does not appear at the top of the screen. you can choose to have the pick list display by selecting the check box.
default view choose from the pick list the view that displays when you open calendar.
show time bars activates the time bars that appear in the day view. the time bars show the duration of an event and illustrate event conflicts.
show category column displays the color-coded circle between the time and event. the color indicates the category the event is filed under.