How to rebuild Intel RAID?

Question

ASUS

One disk fell off from the FakeRAID RAID1 array (the array was created on the basis of the Intel Rapid Storage controller built into the RAID chipset) on the ASUS motherboard (I’ll tell you the exact model, if necessary, it’s hard to get inside the computer). The array is marked as degraded. I turned off the computer, changed the disk to the same new one, opened the UEFI BIOS of the motherboard, started the process of rebuilding the array. The status of the array in the Rebuilding BIOS, but the hard disk access light on the computer case does not blink. Does this mean that when you are directly in the BIOS, the array is not built? Then at what point should you stop the computer from starting up and let it build an array? I'm afraid to rebuild on a working system