Form can have different versions. This can be useful for some purposes - e.g., when it is needed to make changes in some form, but keep previous version and do not re-configure actions that use this form (as it necessary if simply clone the form).

When you created a new form, it will automatically became a Primary version. To create another version, you can go to form builder and  click "Save as New Versions" menu item (1):

To Manage Versions opens menu "Actions" and click "Manage Versions" item (2):

The "Manage Versions" popup will be shown. Here user can:

• Make some version primary (3)
• Open some version in form builder (4)
• Delete version (5)