Virtualization: limited to 8 cores (CPU) for Win7 VM in Virtual Box

Running the host of Mint 19 (kernel 4.19.2), Virtual Box 5.2.22, AMD 2990WX (32 cores).
My virtual machines are limited to 8 CPUs (Win7, Ubuntu and Manjaro). I have seen screenshots of selection of up to 16 CPUs and talk about even more. Is there a configuration that I'm missing in Mint or Virtual box?