Bios Setup
The most easy way to make 2 NUMA node is to press F9 (set to default) in BIOS screen.
EDKII Menu -> Socket Configuration, press F9.
If you don’t want to set to default, then.
SNC | Disable, Disable will make to 2 NUMA nodes
EDKII Menu | Socket Configuration | UPI Configuration | UPI General Configuration | SNC [Enable/Disable*]