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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.

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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.