Drag & drop tickets on Gantt tab
In order to drag & drop tickets on Gantt, users need to turn off all Quick filters and turn on view setting Show completed tickets

Quick filter & Show completed issues
At this point, you can drag tickets on Gantt
In order to drag & drop tickets on Gantt, users need to turn off all Quick filters and turn on view setting Show completed tickets
Quick filter & Show completed issues
At this point, you can drag tickets on Gantt