Don't switch to full screen automatically

Hi Guys, 

If you look at my form and go to publish for Squarespace, the option for not switching to full screen is disabled for me. 

http://prntscr.com/ibgtah 

How can I change the code so it doesn't to to full screen automatically? 

Thanks. 

Nigel 

Firstly, when checking your screenshot, I've noticed that the option Fullscreen is set to "ON". 

But, I also suggested that you have tried both: ON and OFF. 

So, can you please provide us an URL of a page where your form is embedded for a closer check?

We will wait for your response.