Hi, Im pretty new to sketchup, so I bet this is simple, but I cant find anything on it online. I just want to specify the thickness of a panel after I draw it will the rectangle tool. for instance, if I have a 4"x8" panel that I draw with the rectangle tool, how do I make it appear as a 3/4" wide “material” or “wall”?
Sketchup is a surface modeller, you draw edges and faces, not ‘solids’ unlike a solid modeller.
So your rectangle is just that, a rectangular face with 0 thickness.
To give it thickness use the Pushpull tool to pull it to 3/4.