How can Sanjay prevent his team from editing tickets once marked as "Complete"?

Locking the rows is the most effective method for preventing a team from editing tickets once they have been marked as "Complete." When rows are locked in Smartsheet, they become read-only for users who do not have permission to unlock them. This ensures that no further edits can be made to those rows, preserving the integrity of the data and maintaining an accurate record of completed tasks.

In contrast, changing permission levels may limit access to the sheet or specific areas within it but doesn't specifically address the need to prevent edits on already completed tickets. Hiding the completion column can prevent users from seeing whether tickets are marked complete, but it doesn't stop them from editing the rows. Archiving completed tickets removes them from the active workspace and may help in organizing but doesn’t directly prevent edits while tickets are still visible in the primary sheet. Therefore, locking the rows is the most straightforward and effective approach for Sanjay's needs.