How to change default desktop for all users

[MarieRivier]

:012:
Gomene Senpaï  !!

You can use any directory.
When you click on the "Folder" ComboBox, the last option is "Other...". Then you may choose a directory (folder) of your liking.
I always use a custom directory that resides on my data partition (different from /home!).
Still, if you use the /home (directory or partition) you can create a directory "Backgrounds" and place there your favorite images.
This approach prevents an overwriting in case of upgrade.

The image you show below this quote just allow to impose the same background on any desktop for ONE user: all his/her workspace.

I want to impose a default background to all new users something like /etc/skel/backgrounds which will set an imposed background for users when the usr folder is created .

The default location for the desktop background is /usr/share/xfce4/backdrops

Cool, now I can set my default background and share it with all user account. My question is "How can I set it as default background for all users and forbid them to change it ? "