Evergreen 3.3.3
In Evergreen 3.3.3 in the MARC Coded Value Maps/SVF Record Attribute Coded Value Map Configuration (Administration -> Server Administration -> MARC Coded Value Maps) there is no longer a column for Composite Definition. In Evergreen 3.1 this column has a Manage link which takes the user to the Composite Attribute Entry Definitions screen (see screenshot) where they can add a composite data expression or composite data tree. (These expressions/trees tell Evergreen how to determine what format icons to display for which records, which characters in the MARC to look at when a particular search format is used, etc.)
There doesn't appear to be a way to access the composite attribute entry definitions in the 3.3 web client.
Weighing in to confirm I see this too and remark that this is incredibly frustrating to have missing! I tried to go back to the old interface (eg rather than eg2) using the link from previous versions, and while the editor appears and lets you write definitions, they fail to save.