With Windows 10, Microsoft added removable drives directly to the left pane of File Explorer called the "Navigation pane". This change is intended to speed up access to your flash drives and external drives as you don't need to expand the 'This PC' folder any more. However, some users might prefer the older behavior where all drives are grouped under 'Computer'/'This PC'. In that case, you would want to hide removable drives in the File Explorer's Navigation Pane in Windows 10. While Windows 10 does not offer any settings to hide removable drives, here is a simple Registry tweak which will allow you to do it.