On Windows 10, I enabled hibernate, but it goes to the login screen instead of hibernating.

Hi,

Thank you for posting the query on Microsoft Community.

I do appreciate your efforts and time.

Try to run the Power troubleshooter and check if it helps.

Power troubleshooter will automatically fix some common issues with Power Plans. Run the Power troubleshooter to adjust your computer's power settings. The Power troubleshooter checks things like your computer's timeout settings, which determine how long the computer waits before turning off the monitor display or entering sleep mode. Adjusting these settings can help you conserve power and extend your computer's battery life.

1.      Press Windows key + W and type Troubleshooting.

2.      Select Troubleshooting and click on System and Security.

3.      Click on Power and follow the  onscreen steps.

Also, try to change Power settings.

1.      Go to Settings. Then System. Then click on Power and Sleep.

2.      Click on Additional power settings. Then "Choose what the power button does".

3.      Click on Change Settings. Select the settings you want.

4.      Save Settings. 

Hope this helps in resolving the issue. If the issue persists, do get back to us. We will be happy to assist you.