O365 - Ability to search for a constituent record in the system (before Add)

Ability to search for a constituent record in the system. We always ask users to search to make sure a constituent doesn’t exist before they add a new account. While the ‘Summary’ feature essentially lets them do this for an email, there doesn’t seem to be a way to do it for a new constituent they might wish to add. Maybe we could add ‘Constituent Search’ in the drop down under add new.