I can search by RIC with the old tool and it will give me the venue.
That doesn't seem to be the case with this one.
How do I know which field list the RIC use
You can use Context ID in the global search function.
Context ID is a unique identification code for Venue Field Lists. You can locate this numeric identification code by looking at the field CONTEXT_ID(#5357) in Eikon or retrieve the value of the field using any of our Elektron APIs.