Filtering using a Multiple Choice Field

I’m creating a simple audiobooks management app. When trying to apply an ad hoc filter using a Multiple Choice field, I’d like to be able to select more than one of the drop down genre options, such as “Sci-Fi” AND “Fantasy”, but I can only select one at a time. Is this not possible? (I’m on a Mac and I’ve tried holding down the Control Key when selecting a drop down value, but to no avail)

It’s not a huge deal. Once they apply the filter, the results display a column that shows ALL the genres assigned to a title, so they can use their own discretion at that point. Or, they can just add another “Or Filter” to the search which is easy enough.