Once a form has been submitted, it goes into the Submitted Forms page, (Web Portal > Forms > Submitted Forms) where you can make further changes to your forms (based on form permissions and user permissions).
Form actions will also be processed once a form has been Submitted.
The Submitted Forms page can be customised to be able to see form fields as columns and to be able to group form templates together in a Custom Submitted Forms tab.
Submitted forms tabs are also accessible through the app based on the Permissions settings.