Show The Next Assignment When Completed option enables one to quickly redirected to the next assignment when one finishes with the current one provided that there's subsequent assignment for the same user immediately after completion of the current one.
Map to a Form
Unless there's a very specific need, each Each activity would be mapped to a Joget Workflow Form Builder's Form.
Map to External Form
One may also point an activity to an externally hosted form by specifying the specific URL path. Read more at External Form.
Run Process is a special activity which can also be mapped to a form. A User will see this form before the actual start of the process. The process will only start after the user submits the form. This is particularly useful to reduce unnecessary creation of process instances.