Calendar
Show calendar weeks: when enabled, your calendar will display numbers representing calendar weeks. Calendar week numbering is based on the ISO 8601 standard.
Double-clicking a date: this controls what happens when you double-click a date on the calendar.
When "starts a new event with date" is selected, then a new event will be created with the date you double-click. This allows you to start an event without typing in the date information.
When "shows date in (calendar application)" is selected, any date you double-click will open automatically in your default calendar application. Please note: Microsoft Outlook and Entourage do not support this option. Instead, this option will open the calendar in Outlook or Entourage.
Event list shows: this controls how many events will be displayed in the event list. For example, you might only want to focus on today and tomorrow's events or perhaps you want to see the next 20 events. The choice is yours.
Show events from these calendars: unchecking calendars prevents specific calendars from appearing in Fantastical's event list.