Updated the BIOS to 4007 and installed a 5800X and the settings for PCI-E bifurcation have disappeared.Will this functionality be restored in a future update to prevent my Hyper M.2 x16 from becoming an expensive paperweight?

Hi all.Just updated BIOS to 4007 and installed a 5800X but PCIe bifurcation settings have disappeared from the BIOS,Before the update I was happily running a Hyper M.2x16 V2 with 3 nvme drives on board but now I can only access 1 of the drives.I hope...