Thanks for the suggestions - I had tried the min/max length before, but that did not help. I tried your idea with the default value, but that only led to that value being preselected. Just to clarify to potential readers: You set up a prompt as a multiselect object by setting "User selects values from a dynamic list" Number of values=Multiple values Data Source=some dataset Column=some column from the Data Source If you run or Preview, you get two "boxes", Available and Selected. The data from the attached data set appear in Available. The boxes are both tiny and seemingly do not scale with anything, not the window width, the data properties or anything.
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