I replaced a bad drive and the RAID did not start rebuilding

My G Speed es 12TB was turned off for about a week. I logged on to PC and turned the RAID switch on. I logged in to the G Tech local host site and there was error on RAID gui I went to “Device Status” and identified the “Failed” drive on (4_1). I prepared a replacement drive and “Hot Swapped” the drives. The RAID did not start the rebuilding process. I went to “settings” and saw that it was already set to “auto rebuild automatically”. But it did not start. My question is How do I Start the Rebuild?

Thank You,