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How to disable memory slots in Z690 hero bios

Level 7
From the sticked ROG Z690 Overclocking Info[6815].pdf file,
there are some descriptions as below,

MC0 D0 (Memory Controller 0, DIMM 0): Slot 1
MC0 D1 (Memory Controller 0, DIMM 1): Slot 2
MC1 D0 (Memory Controller DIMM 0): Slot 3
MC1 D0 (Memory Controller DIMM 1): Slot 4

But for example, 2x16Gb RAM was put in Slot 2& 4,
If disable Slot1&3, the 2 dimm can be see from windows, but it only has a capacity for 16GB.

Is this a wrong description in the sticked pdf file, or a bug in BIOS ?
Anyway, what is the correct way to disable Slots as wanted ?