For further information on accessing the UEFI (BIOS) system setup on your Dell system, please visit the Dell Knowledgebase:
Link: Access UEFI (BIOS) System Setup from Windows on your Dell System | Dell UK

For further information on accessing the UEFI (BIOS) system setup on your Dell system, please visit the Dell Knowledgebase:
Link: Access UEFI (BIOS) System Setup from Windows on your Dell System | Dell UK