Background Template 
Autor: A. J.
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Hello,
Is it possible to change the background picture? See the picture.
Publicado en
A.J.
At a guess I would say it is a background image under Row Formats.
Step 4 Pages, Row Formats
You can place any image behind a row of cells, and set parallax on if you wish.
My apologies if I am wrong about this template - I could not locate it to check.
Autor
Thank you Eshac, It works.