Stroke (Outer) lets you add an outline to text on a colored background.
First, select ① the Material tool and choose a background. Tap ② Geometry Pattern (Color).
This time, I selected ①Stripe (Blue) 05 .
Tap on ① ✓ to apply the material.
Open ① the Layer window, and move the material from the previous step② underneath the illustration layer.
Add ① a new layer and select ② layer.
From ① the Tool Selection window, select ② Filter.
Select ① Stroke (Outer).
Drag ① the sliders left and right to make adjustments.
Open ①Color Picker . Drag the ②Slider to adjust the color.
When finished, return to the canvas with ① ✓ button .
Finished.