Hi. Up to 4.6 xfce4-mixer's window used to have a minimize button. Since the upgrade to 4.8 (or so) this minimize button disappeared. Please add a minimize button again as it often very practical to minimize the mixer dialogue and re-open it from the panel when needed. Right now, the only workaround is to move the window to some edge or corner of the screen. Thank you. Kind regards Andreas
*** This bug has been marked as a duplicate of bug 7623 ***