Adobe Illustrator CC Classroom in a Book (2019 Release), First Edition

Choose Select > Deselect.

Choose 1 from the Active Artboard menu in the Properties panel to navigate to the first
artboard with the main scene artwork on it.

In the Brushes panel (Window > Brushes), double-click the Lights pattern brush to open the
Pattern Brush Options dialog box.

Change Scale to 20%. Click the Outer Corner Tile box, and choose the pattern swatch named
New Pattern Swatch 1, you just created, from the menu that appears (you’ll need to scroll).
Click OK.