Responsive Forms Design: How to resize date field to smaller to fit 3 controls in repeating section row

Hi All,

I am just starting to work on Nintex New responsive forms release. I got a form that was designed by colleague which has two controls in a row of repeating section (both are date fields) , now I need to add a check box (Yes /No) control as 3rd control in the same row. but when I drag the control, the date controls are not becoming small like how they used to be in traditional forms. also when I physically attempt doing decrease buttons on date controls they aren't changing even an inch  , can somebody shed on light here how to tackle this ?

Thanks,

Jaya