Javascrips popups box resizing?

I created a PDF form to be distributed to a lot of clients.  Inside the PDF form I created a lot of information buttons in javascrip.  However, in some occasion there's a lot of text to show for instructions and when using a laptop specially, they can't see the bottom of the box because it goes off screen on the form.  I know all about changing resolution and changing the view size as well, that isn't the problem.  I need to resize the popup box to make it wider instead of longer, to be able to show the text properly.  I was wondering if there's a way to adjust a popup box (or any javascrip created box for that matter), to play with the width and lenght size?  I'm using Acrobat DC.