The top menu bar is missing and everything is disabled

"The top menu bar is missing and everything is disabled: Hello guys, I had to turn off my machine by holding the power button down because it froze. After I turned it back on, the top bar is missing, I cannot click finder items as they are grayed out and I am not able to type."

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Troubleshooting an Unresponsive Mac:

1. Get to Finder:

See if you can get to Finder, and then Force Quit all items:

See my User Tip: [command + tab] Use it to Access your Mac when Something is Not Responding - User Tip

then...

2. Boot Into Safe Mode:

Shut Down your macOS, and then boot into Safe Mode. Go here: Start up your Mac in safe mode - Apple Support. In Safe Mode, restiveness ought to work, work because in Safe Mode, items only load as they would be default). Once in Safe Mode, wait 30 seconds, reboot, and see what occurs. If you have one, use and external keyboard for this.

You might simply be stuck in "FullScreen"

Try moving the cursor to the top left corner of the display, near where the solid Apple for the Apple-Menu would be, and a little Higher.

The menubar should appear, including the red yellow green screen controls. Clicking the green button should cancel Fullscreen.

"I don't understand what the problem is. I feel like if I can manage to shutdown or restart the Mac without having to force shutdown by using the power button, this issue will be resolved. Given the situation, how can I shut down or restart the Mac?"

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Thanks for the video.

Reinstall the macOS:

If you are able to type a password, or are simply able to click, to log into the Mac, then there's no obvious hardware problem. I'd say take it a step further, and try a macOS reinstall. Thing is, if you never backed up your Mac, and this fails, then you'd likely have to reinstall it all anew.

How to Reinstall the macOS:

Nothing would be lost. It's just that misplaced items would be placed back to where they should be and corrupt system files would be replaced by clean files. Go Here: Reinstall macOS - Apple Support.

Another keyboard shortcut to try is Command-Option-Esc.

This should bring up the 'Force Quit' dialog, and list every running major app. Sometimes you can select one, especially one shown as "not responding", and click to quit the selected app. Then you might be able to recover from there.

'Press and hold the power button for about ten seconds' effects an emergency, uncontrolled power-down. Nothing is saved.

This should never be an ordinary use, but you do not have an ordinary problem.