Unfortunately, Microsoft doesn’t allow you to remove 3D Objects and other folders from File Explorer using Control Panel or Settings. If you want to remove these folders, you need to use Registry editor and delete the entry.
With the Sun Valley update, Microsoft is looking to reduce the clutter in File Explorer and they plan to hide the 3D Objects folder by default. After the update, this useless folder will no longer be shown under ‘This PC’ unless you right-click and select the “Show all folders” option on the navigation pane.
I know this is a small change, and I know it’s insignificant, but these unremovable garbage folders always feel like such a slap in the face. It’s an annoying reminder that when you use Windows, you don’t really own your computer.