Events+ Week Starts Sunday or Monday depending on page

The calendar page starts the week on Monday. https://christiangays.com/events/
See screenshot

The Front End Add or Edit page shows weeks starting on Sunday. https://christiangays.com/edit-event/
See screenshot

This inconsistency really makes things difficult.

Can we please make all calendars start on Sunday - i.e. specifically the main Calendar view https://christiangays.com/events/

Support access is granted.
Thank you.