Hello,
I'm running Mac OS Mojave 10.14.5 with a nVidia GeForce GT 650M 512MB graphics card and my Intel HD Graphics 4000 1536MB embedded graphics card. I've got 8GB of DDR3 Memory and an Intel Core i7 2.3GHZ processor. The settings are completely unavailable to me for some reason even though my specs should be able to support it. Any ideas if this is Mojave related or Client related? Here's a screenshot of my mac specs