When the portal users are on the edit page or the detail page of any module, they can ‘edit’ the module record or ‘delete’ it as per requirement. Once they click on the Submit/Delete button, they will be redirected to the page as configured from the “Form Widget”(Redirection Settings)
From the module listing page, the portal users can navigate to the edit page. When they delete the module record, after success, they will be redirected to the page as selected for the “Delete Redirection” page. 
But, if the portal users edit the form details and click on the Submit button, they will redirect to the page as selected for the “Submit Redirection” page.
Similarly, from the module record’s detail page, the portal users are redirected to the page that has been set in the form widget for the Detail page.