How to make LighBox embedded form mobile responsive?

I want to turn the Responsiveness ON after clicking preference, but all i see is this > screenshot below. 

Why does my form not have a responsiveness choice button? or is it hidden somewhere? Need to turn this ON because I'm Having issues with the mobile view on my lightbox embed form. Already checked make responsive in Design btw. 

This option is no longer available in the preferences because all our forms are responsive by default: however, you're mentioning that you're embedding your form using the lightbox method, at the moment this embed method does not support responsive and it will have the same width no matter if you're viewing your form in a mobile device.

However, we can escalate this to our second level as a feature request if you want so the lightbox shown will load responsively, there is a way to achieve it with CSS as well, but, please provide us the link where you're form is embedded on, we will be glad to help you with a workaround to make it responsive.

Also, please do confirm us if you want this thread t be escalated, we will be glad to do it.