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thank you.
My design it to put the thumbnail to the left of the main image.
I guess that we need to change css as well as this file:

\wp-content\plugins\portfolio-slideshow\inc\shortcode.php

All <div> classes are defined in there.

Elron,

if you don’t want to pay for it, then you can try to modify the code in this file:
portfolio-slideshow.js

it is in the directory of here:
\wp-content\plugins\portfolio-slideshow\inc

thank you for the post tonocarvacho.
No further question now.