Volumen control in Kodi 17 music player missing

When I play music I often need to change the volume.
However there is no volume control in the Kodi 17 (Krypton) music player.
But I need it because I only use my mouse as remote (The keyboard is to big.)

Is there a skin that has this important feature?

Or can I add the volume control to the default skin? If so, how?