How to show the "Calendar View" in the list view dropdown button

[NCP]

Hi @JC_Ang,

Please apply the custom/client script on Listview.

frappe.views.calendar["Delivery Note"] = {
	field_map: {
		"start": "posting_date",
		"end": "posting_date",
		"id": "name",
		"title": "customer",
		"allDay": "allDay",
		"progress": "progress"
	}
};

Then reload (Ctrl + Shift + R) and check it.

Please set your all field your according.

More reference for check it in base:

frappe/erpnext/blob/develop/erpnext/projects/doctype/task/task_calendar.js

Thank You!