Don't want to display the featured image

Hi there,
I'm having an issue with a plugin (*not WPMU)
And wonder if you can help, as it's still WP related ...

The plugin is called "PA Document" (*Standalone Documentation Posts Plugin)
It created a section in the admin, just below the POSTS
And it does the exact same thing as the posts but inside a /document/ folder

Today, to enable the search feature on my site, I have to add a featured image to all docs, same as I'm adding a features image in the posts (*it displays it on top of each message) .... But I don't want the featured image to be displayed on my page (*to avoir duplication) : Would you have a trick so I can make that featured image disappear ?

Access granted ... !
Thanks so much