A developer created a Lightning web component that uses a lightning-record-edit-form to collect information about Leads. Users complain that they only see one error message at a time about their…

A developer created a Lightning web component that uses a lightning-record-edit-form to collect information about Leads. Users complain that they only see one error message at a time about their input when they save a Lead record. Which best practice should the developer use to perform the validations on more than one field, thus allowing more than one error message to be displayed simultaneously?