This message was posted on behalf of Intel Corporation
Yes, you enter the RAID bios by hitting CTRL-I but lately I have seen some manufacturers that are including this features through the computer BIOS.
Reset to Non Raid would be the best option to remove this RAID configuration or even delete the volume you have created.
I recommend checking with Acer for other ways to access the RAID BIOS.
Additionally, try this link for more information: https://community.acer.com/t5/Predator-Laptops/predator-G9-591-58GN-BIOS-Unable-to-Access-the-RAID-Option-ROM/td-p/436242
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.