How do I create multi select list of values DFF?

Summary:

I have a requirement to create a DFF field that has drop down values which allows users to select 3 values from the drop down. Is this possible and if so, how do I do this? So far I have only been able to add a drop down DFF that only allows to select one value.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

How do i make this below field multi select?