Yes, you can resize the lightbox from Terms of Service quite easily.
In the form builder, go to the Form Editor of your online form, select your T.O.S field and from the left-side panel, under the Agreement text section, you’ll find the options Popup width and Popup height. Select the default values to type in the desired ones, or use the slider and you’re done.
Here is a list of the most frequently asked questions. For more FAQs, please browse through the FAQs page.