Synchronization is not successful

Please confirm the following points.

• Calendar is selected in Settings> iOS Calendar Sync.
• Calendars is on in Settings App> Privacy> Shift Work Calendar.
• Is the calendar selected in this app displayed in iPhone calendar app?
• The working hours of the shift pattern are set to a time of 0:01 or more.
  If it is 0:00, it can not be registered as an event in the calendar, so please set a time longer than 0:01.

iPhone's calendar list is not displayed on the setting screen

Please restart the application and open the setting screen.