Limiting characters for Box Sign text field

I'm using Box Sign and adding some text fields to fill out and sign forms; one field in particular is a w9 There doesn't appear to be any way to limit the characters in a text field. The user can just keep typing past the length of the text box that I stretched out for them. This makes this feature kind of useless for any text fields that people DON'T want to take up an entire line, because the user can just type anything they want beyond the areas that we want them to fill in.( e.g. a Tax form, you can easily just blow past the rectangular box)

There doesn't appear to be anything in the regular or advanced options to deal with this.

Is there any way to resolve this?

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