I cannot find any documentation (Cloud) on the proper use and set-up of the Forms - Dropdown List macro.
It sounds like you are using the user installed add-on Forms for Confluence by Adaptavist.
I am moving your question to Adaptavist's part of the forum, to get the vendor's attention. In the meantime, hoping this will help: Dropdown List
@Lori A. Bailey - here you go! https://docs.adaptavist.com/forms/confluence/cloud/latest/field-macros/dropdown-list.html
UPDATE: Whoops, I see you already have the link!
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