The plugin adds a function so that the user can choose on the mobile phone if the site should be in mobile view or desktop version remove view. Switch to desktop version plugin lets the user choose their responsive own format. In many cases there might be things missing or not displaying properly & a desktop view would switch kill be preferred. For toggle testing ( live preview ) please use a mobile device. Viewing view a site is impacted so much by responsive design & smaller screens make it no virtually desktop impossible to decide the best option