I enabled Kubernetes within the Docker GUI by checking it's option.
Now the "working" indicator is permenently on, and all options are grayed-out, so I can't even disable Kubernetes by unchecking the option, and get my previous setup back to normal. Oddly, I can see a bunch of k8s containers running though, but that's beside the point. What I'd like to do is just disable the Kubernetes option again. Does anyone know a way to do this? Thanks!

Olympus
Single & Not Looking
I had this issue awhile ago, and never found a solution to actually get Kubernetes working via the Docker GUI. Also, getting any help on any of the 'official' forums was completely futile.
Only way I could disable Kubernetes again was to add the following lines to my Windows Hosts file:
Then upon restarting Docker, it would time-out trying to connect, BUT would then allow me to access the previously grayed-out options, and uncheck the Kubernetes box again. Note that I'm goin on memory and it's been a little while, so all 3 of those lines might not be required for this, but I think the last line is the one that did the trick. Either way, it won't hurt to add all 3 temporarily for this, and then just remove them again after you're done fixing Docker.
I just ended up installing Minikube instead.