Why do I have transparent walls in my project?

I am new with Sketchup and while working on my first project suddenly I click on something and turned all my walls in a transparent way.

I have no clue how did I do it but can you please help me out to get back on track? I want my walls no transparent again

Thanks in advance

Tap k on your keyboard.

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By way of explanation of Box’s reply. k is the shortcut for View/Edge Style/Back Edges - it toggles them on and off.

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Someone should 3D print a key cover to go over the K so that new users can’t hit it until they take the time to learn about the keyboard shortcuts and what they do. :smiley:

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I would love to put one on top of my CapsLock key…

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