File Sharing is off

How to disable File Sharing

Open System Preferences, go to General, then click Sharing.
In the list, uncheck Internet Sharing.

How to disable on Monterey and older

Open System Preferences, click Sharing.
Click the lock icon in the bottom-left, then enter the account password.
In the list on the left, uncheck Sharing files.

Time to fix

< 1m

What

File sharing allows for the Public folder on your Mac to be publicly accessible. This should only be allowed in rare cases and disabled once finished.