after some time googling i found solutions to my problem.
When i created a new page it always had sidebar so,
in page.php file need to delete string
“<?php get_sidebar(); ?>”
also i read about “custom template to wordpress page or post at
http://www.maheshchari.com/wordpress-custom-page-template/
and that trick gave me in page editing/creating menu at right side to choose full width template without sidebar or your custom template, which for example i created with name pagenew.
That’s it.
