Unfortunately, there's no way to automatically remove duplicates from your results when you're in a database. However, you can use a reference management tool to store your references and then use the built-in features to remove any duplicates that you may have.
There is a Library Guide for reference managers that lists the various options and it would be a good idea to try a couple before deciding which one meets your needs.
If EndNote is your chosen Reference Manager, this Panopto Video will talk you through how to use it. Information about removing duplicate results is around the 42 minute mark.
Your Academic Librarian should be able to give you some help if you have any questions about using some of these resources.
