Yep - the Documents folder is still present even if it disappears from Quick Access, This PC, or the desktop. First press Win + E and type this into the File Explorer address bar: %USERPROFILE%\Documents then press Enter. If the folder opens, it still exists and was probably just unpinned or hidden.
You can also try: C:\Users\YourUserName\Documents (replace YourUserName with your Windows account name)
If that fails, search the drive directly. Open File Explorer, select This PC, and search:
kind:=document
or search for:
Documents
If Documents disappeared from the left navigation pane only, restore default folders by right-clicking the navigation pane in File Explorer and enabling “Show libraries,” or reset folder locations from the folder properties dialog if available.
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hth
Marcin