Every instance of Malcolm! comes complete with a hosted hub. But you might not want to use it and may prefer to turn it off. No problem!
To turn off your hosted hub go the settings section of MyMalcolm, then select "visibility" in the vertical left hand navigation. You can then select "Disable the instance Hosted Hub"
Once disabled, any traffic hitting your Hosted Hub URL will see a 403 error. If you'd prefer to redirect that traffic somewhere else you can do this by selecting "Advanced" in the vertical left hand navigation then entering your redirect URL.