View in HD at http://macmost.com/e-1435. The menu bar icons on the right side of your screen are added there by System Preferences, system extensions and apps. You control what is there by looking at those various sources and switching them on or off in the preference screen or app that owns the icon. You can move them around by dragging with the Command key held down. Order can be important as the leftmost icons may not be visible when running some apps.