Form Sub-class hiding columns when form open in application

Hi,

I have developed a Form for environment 12.2 and form builder is also setup as per environment.

I have applied 'sub-class information' to each field in form. I have moved form in application and complied it.

as soon as i open that form in Apps - all field are hidden on which i had applied 'subclass information'

what is the reason it is hidding fields which has 'subclass information' applied

Thanks,

Kaushik