Kano Mouse cursor disappears

Newb here. What’s the solution when the mouse cursor disappears? I can tell the mouse is still connected (the “X” to exit an app lights up when I move to the top corner), I just can see the cursor. Any magic keystrokes to kill an app, or force a reboot? Note that I was able to reboot by pushing the red button (mouse appears on the reboot screen), but then it’s still not visible on restart.