How to reduce or disable shared RAM on Windows 10?

[Blue_2021]

I have a dedicated GPU with 8GB and 32GB of RAM but 16GB of RAM is being shared with the CPU; so de OS only can access 16GB.In the B450-F Asus BIOS doesn't show any way to change this.I don't know if this is being do it by the BIOS, the Nvidia drivers or by Windows itself.Please help.

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