Viewing modern list as calendar

I have a modern SharePoint list. The list has various task-oriented fields, including Title, Start, and Due. I would like to be able to toggle a calendar view of the list. There was no built-in calendar view available under the view options, so I created one ("Create new view"). The new calendar view has column headings of Title, Start, and Due. The problem is that it has no content. If I toggle back to "all items," everything appears fine. If I toggle to the new "Calendar," it's empty except for the column heads. What did I do incorrectly? How do I do this? I'm assuming that modern lists can be viewed as a calendar...