Pre-filled multiselect on a form

I have a multi-select field in my base. I want to create a form that has one of the selections checked when they open the form but allows people to select additional choices. I know how to do it in a text field but can’t figure out the syntax for a multi-select field (assuming it’s possible).

Thanks for any help!

I would suggest using the Prefilled Forms App by @kuovonne. It removes a lot of the guesswork and frustration for prefilling forms.


@Hannah_Wiginton 's suggestion looks like a good solution. Just wanted to share a thread I found that offers other possible solutions:

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