Welcome to the forum:
You already have your project open, but in a flexible layout. The actual menu of the flexible layout to display your project content is on the very left. In your case it is configured so that it is only visible when you move the mouse to this left edge where a narrow dark bar is visible:
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If you prefer the
fixed layout (you probably used it before), leave the project and set the fixed layout in the upper right corner (gears):
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Information about the two layouts can be found there:
www.lwks.com/index.php?option=com_kunena&func=view&catid=26&id=142324&Itemid=81