What "entertainment space" are you referring to? Is it that dot on the left side that looks like it can be dragged out?
Also, are you sure it's from Google? I've had a couple of Lenovo tablets, and they usually have some preinstalled Lenovo apps -- I think one of them might have been an "entertainment center." You can try going to the Settings>Apps menu, tapping Menu>Show System, then looking for the app there. If you find it, see if you can uninstall it. Since it's a preinstalled app, you might only be able to disable it, or possibly not even be able to do anything to it at all.