On a fillable PDF, how do you enable text boxes to expand as text is typed?

Working on a fillable PDF form, trying to get the text boxes to expand as needed when text is typed into them. I have set the boxes as Multi-line so you can format within the box, and text scrolls when box is filled, but I would like the box itself to expand so all text is viewable together, and also so that it will print and show all of the text.
Thank you!

Click Help button when creating the form to see the options and/or read the manual.