Can no longer select "Folder" in column configurator v10.0.3266

I had been running 10.0.3115 and upgraded to 10.0.3266.

“Folder” is suddenly no longer an option in the column configuration choices for displaying the message list. Was this an intentional design change (which I would ask be re-thought), a bug (which I’d ask to be fixed), or something I can remedy on my side (perhaps through a registry change or something else)?

Self-solved: It appears that folders can only display in columns when “Show Conversations in All Views” is NOT selected. Changed to “Show Conversations in Message Detail Only” and the Folder column re-appeared when viewing the message list.