Sometimes simply restarting your Mac can help you save the problem and bring the mouse back. Keep holding the keys till you hear your Mac restart again. When you hear the startup sound, press Command (Cmd) + Option (Alt) + P + R. To reset NVRAM, first switch your computer off and on again. It can also help you fix your disappearing cursor problem. NVRAM is responsible for storing data and computer settings if the power is switched off. Resetting NVRAM is a common thing to try when troubleshooting your Mac. If your mouse doesn’t reappear then, try force quitting an app that you think might be causing the problem.
To do that, press Command (Cmd) + Option (Alt) + Escape (Esc). When your cursor disappears, bring up the Force Quit menu and see if that fixes the problem.
