when trying to switch secure boot mode from custom to stands in the security section Nitro5 AN515-56

I'm having problems with the bios of acer nitro 5 AN515-56 when trying to switch secure boot mode from custom to standas in the security section, it's blacked out and can't be adjusted, I tried to change it in the boot section but still can't adjust it in secure mode and windows also doesn't recognize secure boot. I need help

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