Hi grzegorz
I understand that visibility sections are used to show or hide the sections depending on a select-box or radio button choice.
So if I choose option 1 section, show me only option 1 to data entry. If I choose option 2, show me only option 2 section to data entry.
If I change my mind and switch back to option 1, my 'old' option 2 fields should not be saved into DB. Only save option 1 section which is currently visible.
Maybe you can use "hidden field element" to store values into database that you don't want to show in the form.