I am using EE 2.11.2 and Forms 3.5.3
In the form builder tool, when you click the gear icon to edit the field settings, the Field Settings popup shows up. It is supposed to appear right where that element is in the form. This works for most form elements, but it doesn't work properly for form elements within a multi-column layout. The popup shows up at the very top of the form, which means you have to scroll all the way up there to edit the settings.