OK. So I don’t think you can remove the names from there. I mean, if you did, and in future you wanted to install something again, there would be literally no way to get it back. That content can always be added back in future. There is no way to tell the system to forget items. Why do you really need to clean up that category anyway?
The “Installed” category is more important as that’s what is actually using storage space on your disk.