Its possible to organize the form items in the content editor to make it easier to navigate through.
Create folder under forms and move forms item into folders, in the shown image there is created a folder called Tradecouncil-EN to organize items that is related to that site, the other folder called wffm is created to contain all the Sitecore-WFFM-Form items that is going to be created when forms are inserted.
Its always possible to move the items if they not located in the wanted folder even after the form is created.