Why is my desktop the same as home folder?

My desktop (not the /home/user/Desktop folder) shows the contents of my /home/user folder. I don't know how I have done it and can I have some help on undoing it? The /home/user/Desktop folder just contains my desktop files which do not appear on my desktop.

You can change you desktop folder i.e the folder you want to use as your Desktop.

• Open the ~/.config folder. (Press Ctrl+h to show hidden folders.)

  

• Open the user-dirs.dirs file in gedit.

• Change XDG_DESKTOP_DIR to the folder you want to show as your Desktop folder. In your case it is XDG_DESKTOP_DIR=$HOME/Desktop

  

• Now restart nautilus using nautilus -q or killall nautilus and again opening it from Dash.

As simply or shortly, You can set default folders with help of xdg-user-dirs-update command.

Run following command in your case:

xdg-user-dirs-update --set DESKTOP "$HOME/Desktop"

Then logout and login back to show/change effect.

From man xdg-user-dirs-update:

NAME
       xdg-user-dirs-update - Update XDG user dir configuration

SYNOPSIS
       xdg-user-dirs-update [OPTION...] [--set NAME PATH...]

DESCRIPTION
       xdg-user-dirs-update updates the current state of the users user-dirs.dir. If none existed before then one is created
       based on the system default values, or falling back to the old non-translated filenames if such directories exists. The
       list of old directories used are: ~/Desktop, ~/Templates and ~/Public.