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 LINKS button is a widget if for adding links to the thumbnails in the Fluid gallery (Fluid_Video&Link).
The IMAGES is a widget for images only in the Fluid gallery. And is used only to open an image light-box when the thumbnail is clicked.
The VIDEO button is a widget for Videos only in the Fluid gallery. And it is used only to open a light-box to play a Vimeo or Youtube video when the thumbnail is clicked (Fluid_Video&Link).
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For more information on how to use THE Fluid gallery, visit: