Have option in "Up Next" widget control in form designer to hide "Mark complete" button.

In some cases, "Mark complete" closes the sequence activity the wrong way.

For example, an email would be closed with a "Completed" status reason rather than "Sent".

Alternately, the "Mark complete" function could be enhanced to handle each activity type correctly.

• If phone call, ask for status reason
• If email, prompt to confirm and send
• If task, just close as "Completed"
• etc