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

7. Under the Spacing option, click the Side Tile box (the second tile from the left). The artwork
   that was originally selected is in the menu that appears, along with None and any pattern
   swatches found in the Swatches panel.

Tip

Move the pointer over the tile squares in the Pattern Brush Options dialog box to see a

tool tip indicating which tile it is.

Tip

Selected artwork becomes the side tile, by default, when creating a Pattern brush.

8. Click the Outer Corner Tile box to reveal the menu.