To open the popup menu, right click on any area of the view.
You can also drag and drop files and folders between FontExpert views and Windows Explorer (and other programs that work with files).
Be careful when you delete files in standard Fonts folder (usually c:\Windows\Fonts or c:\Winnt\Fonts). Deleting a font file that is located in this folder permanently deactivates this font. It is recommended not to delete font files from this folder unless you are an experienced user.