Option to make the form mobile responsive

Since you changed your program i dont see this option?  Where do i find it?

I believe the option you are looking Mobile Responsive function in the Preferences menu. It was removed in the new interface since there is already an mobile responsive option in the Form Designer. Please check this guide: How-to-make-forms-mobile-responsive

If you have matrix table or configurable list widget fields, then you can also add the Mobile Responsive widget on your form.

Let us know if you have any questions. Thank you.