Is it possible to enable legacy mode on aorus 15p xd to install older operating systems (Windows 7, Vista, XP)

Legacy mode is needed to install older systems. In order for it to appear, they say you need to unlock the bios. But this is very scary for me. And I want to ask if it is possible to somehow enable legacy mode on an aorus 15pXD laptop without unlocking the bios. If this is not possible then I am ready to unlock the bios