Have you tried changing the visibility access from Default to User on the string.
EDIT: Was this the only thing you changed? EXACTLY as you see in the capture screen?
Or the bios has any other mods or changed values?
Did you changed the Default or Fail-Safe to Enable/Disable from AUTO?
How was it flashed?
If no then the mod cant be made with AMIBCP as other modules like AMITSE etc… also needs to be set, in this case use other alternative:
[TOOL] UEFI Editor - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)
[GUIDE] Usage of AMI’s AptioV UEFI Editor + FPT Flash Method - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)