Mac book pro 10.13.6 clean install on a year or two old machine
First, I'd be wary of removing it. I know that "no one uses CDs/DVDs any more" but every once in a while, someone breaks one out, like at a conference or a gift shop, etc.

So, Remote Disc allows you - using a laptop with no internal optical drive - to use a nearby computer (Windows or Mac) that does have an optical drive as your optical drive. Very practical. (You have to install CD or DVD Sharing for Windows 1.0)

But, if you really want to remove it from the sidebar, it's quite simple. Very Mac-like.



Just right-click the Remote disc and select "remove from sidebar."