Trimmed Surfaces vs. Untrimmed when Creating Surface from Planar Curves

Hi, I’m doing an exercise in the Level 3 training manual for Rhino. I’m using a Mac platform. Is it normal that when I create a Surface from Planar Curves that the surface created is Trimmed when I view the object properties? I had no trouble joining it to the other surfaces and created a closed polysurface. Just wondering what the difference is between Trimmed and Untrimmed. Thank you!

A planar surface is usually made by 4 straight lines making a rectangle bigger than your input curves and then trimmed using those input curves.

if you run the UntrimAll command on that surface you will see the original one

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