Selecting lookup search match type for custom metadata fields
Select the match type for searching values within the custom metadata fields in the advanced search form, using the Starts with or Contains filter, when adding a custom metadata lookup field to a search form for :
Documents
Emails
Docs & Emails
Matters
Contains is the default filter. Match type choices are persisted until the custom metadata field is in the search form.
Figure: Selecting lookup search match type
NOTE: The lookup search match type is available only in the advanced search form and not in the details panel lookups.