I can't use the "Group by Time" option under the View menu
I see an option to Group by Time in the View menu, but it is grayed out when viewing any list except one of Apple's 6 included Smart Lists (Today, Scheduled, All, Assigned, Flagged, Assigned, Completed).
Anyone figure out other conditions under which we may be able to use this nice feature for lists they created?
MacBook Pro 15″, macOS 11.6