The Canvas Page template removes header/footer and side bars from existing pages and in new pages. It's a great option for creating landing pages, maintenance pages, and so on.
In the 10Web Builder
Click on the settings icon 
.
Click on the Page Layout drop down menu.
Choose Elementor Canvas.
In WordPress
In your WP dashboard, click on Pages.
Either click on Add New or click on the page you want to set to Full Width.
To the right of the panel, click on Page Attributes.
Under the Templates drop down menu, choose Elementor Canvas.
Click Update to save the changes.
Also see: Full Width Template
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