Admin and Limited Admin users can change a Completed work order back to any of the active status - Open, On Hold, In Progress, In Review, or Waiting for Cost/Invoice/Parts. This can be done for any Reactive work order, regardless of whether you created it or not. You can also reopen and edit completed PMs, except for Floating. Floating PMs can never have duplicates, as they are generated based on the last completed date.
See gif or guide below.
Gif
Guide
From the Work Orders module, use the quick filter and only select the "Completed" status to locate these work orders.
Click on the name of the work order you wish to mark back in an active status.
Simply select any of the other status buttons.
Best practice is to add a comment to the work order on why the work order has been put back to active.
The work order functions correctly and appears under its updated status filter..