If you want to create a page that looks like the one page , please do by below steps :
1. Create new page by using visual composer, you can use backend editor or frontend editor then you create session for that page by adding row and add “extra id name” for that session. To add “extra id name” you need to edit row, example : session-1
2. You need to select page template “One Page Template” for this page.
3. You need to create menu for this page by:
Go to Appearance-> Menu. and create menu with menu items by custom links. In custom links URL field you set “extra id name” of sessions with “#” in front as “#session-1″
4. Go back to one page you are creating and select menu you have created.
Hope it is useful with you !