MajorGeeks shows you how to remove Dropbox from Windows 10 file explorer navigation pane
How to Remove Dropbox From Windows 10 File Explorer Navigation Pane
If you installed the Dropbox app on your Windows 10 computer, you now have a Dropbox icon (shortcut) in File Explorer. The app has no option to remove the icon, but we can remove it in the registry.
How to Remove Dropbox From Windows 10 File Explorer Navigation Pane - MajorGeeks