Select multiple dropdown

Dear Support

I’m trying to finalise a form to allow users to update their details on my site.

I would like to be able to present dropdowns, with users then able to choose multiple options from a long list. (Checkboxes will not work due to the number of options available.)

Please can you let me know how to do this? I don’t see an option to allow users to select multiple options in the dropdowns.

Best

Matthew