Corner Computer Workstation Where Did The Volume Control Go On The Bottom Right Corner Of My Windows Computer?

Where did the volume control go on the bottom right corner of my Windows computer? - corner computer workstation

I used the volume control on the lower right corner of the screen of my computer have and now it's gone, I turned the computer off and then 30 minutes later I was listening to some music and I realized that was very low. I went down and the volume slider was not there, you know how to recover?