Drop Down menu doesn't allow multiple selections

When I was creating a form I had a drop down menu on it. I needed it to allow multiple selections so I went into the settings and selected allow multiple selections. It still didn't work. You should fix that feature of your website

Hi, thank you for contacting us.

Could you please provide us with the form ID or URL, and the dropdown menu that you tried to enable multiple selections in? That would allow us to inspect and assist you further.

Thank you in advance. We are awaiting your reply.