In an Opp Report Filtered by Customer, how do I display the Customer field available in Criteria?

Hello there, i'm trying to create an Opportunity report to include all Opps for only a handful of customers, the Customer column appears as expected, see below, but when i tried to find the Customer field in the criteria it's not coming up as an option, is their anywhere i can find this field in order to be able to filter by customer, i can't use a transaction search as i'm looking for Opps that are not yet secured as well as Order received, and a customer search is proving difficult in terms of pulling in the requisite Opportunity data,