That form looks to be an XFA form, not a form created with Acrobat, so you might want to also post this to the LiveCycle Designer forum.
I'm curious, for which section of the form do you want to select more than one checkbox?
That form looks to be an XFA form, not a form created with Acrobat, so you might want to also post this to the LiveCycle Designer forum.
I'm curious, for which section of the form do you want to select more than one checkbox?