I was going through Adobe Website's official Illustrator tutorial. They have some pre-created sheets where I found this.Can someone tell me how to create this type of sylized backdrop for background as shown by the bounding box in the right side of the snapshot?
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Did you think of checking the Appearance panel? – Jongware Dec 8 '18 at 20:15
They are merely patterns available in the Swatches Panel... "Basic Graphic Lines" and "Basic Graphic Dots". Then it appears the opacity has been lowered after the pattern fills have been applied.