I found a workaround at this Apple discussion
. The Inbox now shows the colored flags but the mailboxes that isolate those flagged messages do not. Still, it's an improvement.
EDIT: I applied the same fix to the Flagged mailboxes and now they show the colored flags.
Last edited by jchuzi; 12/20/20 03:32 PM.
macOS 11.2.3, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365