Close the menu bars before preview/publish. That way you can make sure that they will not block the content on other pages.
To close, select the menu and uncheck the option that says: "Show lightbox parts while editing" .
To edit the menu bars again, you can check the same option and the submenus will show up.
Remember too keep the QUICK ACCESS, LANGUAGE and LOCATION BAR closed, before you preview/publish.
You can click on the bars to edit the content inside the expandable menus, and when you are done you can click again on the bars to close them.
THE SECRETIS THAT WE WORK TOGETHER WE WORK AS ONE
VISION IS THE ART OF SEEING WHAT IS INVISIBLE TO OTHERS.
You have to have a big vision and take very small steps to get there. You have to be humble as you execute but visionary and gigantic in terms of your aspiration. In the Internet industry, it's not about grand innovation, it's about a lot of little innovations: every day, every week, every month, making something a little bit better.
You will never do anything in this world without courage. It is the greatest quality of the mind next to honor.
― Aristotle ―