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There's never been such a setting. There isn't now. Premiere Pro will, by default, use all available resources on a system.
Okay, great. I have no idea where I got the idea that this was a change that had to be made in the setting... I didn't have a computer that had multiple cores in the past when I read that imaginary article... I just remember thinking I'd cross that bridge when I got there, which I did - just got a new computer. But I guess I might've conflated it with something else.
Thank you for clearing that up!
On PC, you can do the oposite, you can allow Premiere Pro to use a certain amount of processors if for any reason you want to keep some to others applications. As Simon says, Premiere will use all availables CPU and Cores.
you can allow Premiere Pro to use a certain amount of processors
If so, it's done outside of PP. There's no such user setting within PP.