Any given plane, unless you make a double sided shader, will only show from one side. This is actually by design.
The easiest solution is to make both sides. Instead of a single plane for a side, you would need an actual thick cubic kind of thing, something with thickness. Then no matter which side you are looking from, you will see something. It works the same in real life. The pieces of wood that make that table have some thickness anyway, and you could look at things from the top and see that thin edge as well. A single plane can't do this.
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