YOOtheme – Create a page without header and footer

• Create a new Article: Dashboard -> Content -> Articles -> NEW
• Create a new menu item with the article you just created: Dashboard -> Menus -> *Your Menu* -> NEW
• Give it a title and select Menu Item Type -> Articles -> Single Article – than select your new article
• Now switch to the Link Type tab and specify whether the new menu item should be displayed in the menu or not. Display in Menu -> Yes or No
• Now switch to the Page Display tab and enter the exact string:

no-header no-footer

• Click “Save & Close” in the toolbar
• Navigate to YOOtheme > SETTINGS > Custom Code > CSS/LESS, and add the following to it:

.no-header .tm-page > header,
.no-header .tm-page > footer { display: none; } 

Note:
If you only want to hide the header or only the footer, enter either no-header or no-footer under Page Display -> Page Class.