Cannot Find Auto-Resize Option for Fillable Text Box

I am trying to auto-resize text in a fillable form I am making, but I do not see the option to. I know when you "Prepare Form" it should be under "Apperance" and I should be able to select "Auto", but the option is not here. Was the option moved or removed? I can allow the long text to scroll for now, but it would be prefereable to auto-resize the text. Thank you!