Trying to start utilizing the neat feature of "Calendar" in a JSM project I have.
Apparently the Calendar uses standard fields "Start Date" and "Due Date" for populating the Calendar, and both needs to be populated for an issue to be visible.
I already have these dates in custom fields, so I was hoping to change how the Calendar is configured rather than duplicating my existing to additional fields but this seems easier said than done.
Found this;
https://support.atlassian.com/jira-service-management-cloud/docs/show-issues-in-the-calendar/
...which states this is possible by "Select Configure views from the more menu (...)"
But I can't find that anywhere?

The one visible I've manually duplicated the values but I have another 187 "Unscheduled"....so what am I missing?