Hi Viswa,
Thank you for contacting syncfusion support.
#Regarding what is the purpose of this and Customization appointment using custom view
We would like to inform you that you can achieve your requirement by using schedule Appointment Loaded event. Inside the Appointment Loaded event, you can customize the default Appointment UI view as per your requirement.
# With the current customization shown, I can't understand how can I assign the appointment subject to custom view per appointment
By custom object , you can assign the appointment subject to custom view as per appointment details.
#Regarding Selection customization using custom view
We would like to inform you that the selection customization are used to customize the selected date background view cell. For Appointment customization, we suggest you to follow the “Customization appointment using custom view”.
Please refer to the following UG link about ‘How to customize the appointment’ for your reference.
#Regarding scheduleView.SelectionView is adding a dummy appointment at 12am of every day
We would like to inform that dummy appointment is the customize background view of the selected date. In default, the view rendering with the selection date as 12 AM in DayView, so, it show like a dummy appointment as we have used the selection background with customize view.
We hope this helps.
Regards,
SaiGanesh Sakthivel