Delete the sidebar space (widget space)

Hello, I install a plugin and it generates pages but under the format article.

The problem is that it does not add me to the field to “full width” as we did when creating article. I search a solution for simulated sends the request php “fullwidth”.
So my goal is to remove this white space that is on the screen: http://prntscr.com/7xafqw

Can you help me to make this change?

Thank you in advance,
Waiting for your reply.