Preference Panes gone in Mail 11.5
In Mail 11.5, when choosing Mail > Preferences, all preference panel icons are missing, and only the Accounts preferences panel is displayed.
An empty window titled "Accounts" with only the red and orange window control dots.
No unfilled pill shaped icon to expand the windows as suggested in a 2007 answer to the same problem on Mail 2.1
Any suggestions?
MacBook Pro 13″, macOS 10.13