Hello,
yes, the email template is configurable. The reminder e-mails reuse the template from notification e-emails, which depends on the calendar of the shift. So for this “Boarding” calendar, you can edit the template in Administration, Calendars, Boarding: Notifications. Edit the Email: Shift Published (Employee) template.
At the moment, we don’t have separate placeholders for start and end time yet, there’s just the {DATETIME} one which includes both date and the shift type label/or the start-end time of the shift. In your example it says “Morning (Sunday)” which is the label of the shift type. If you need the exact start/end time, you can either modify the shift type label to include these times, or set it in Administration, Shift Types, Settings – uncheck Show Shift Type Title In Calendar. This will stop using the shift type label both in schedule view and in notifications, using start-end time of the shift instead.
I hope it helps.