Documents are not displayed in Finder

I think that somehow it became hidden.

You can confirm that: press Command-Shift-period

This will make the Finder show hidden files and folders - they appear grey.

Do you see Documents showing grey now?

If you do, here is how you make the folder visible again.

Open Terminal and type

chflags nohidden ~/Documents

In Finder start with your startup drive>Users>your user. You should see your Documents folder on right side. Then drag it to the left side

Try deleting Finder preferences:

press command-shift-G and type

~/Library/Preferences/com.apple.finder.plist

drag the file to the trash

relaunch the Finder: press Command-Option-escape, select Finder in the list and click Relaunch.

Any changes?

Save for me. Documents folder do does not show in my user folder.

What if you go to Finder Preferences>Sidebar and check Documents. It is checked for me and Documents appears in my SIdebar.

What happens if you press Command-Shift-O in the Finder, or choose Go->Documents?

Does it open the Documents folder?