: To combine shapes, select multiple vector layers and use the Unite or Subtract buttons found in the Arrange tool options.
Version 1.0.4 introduced several specific workflow improvements that became staples of the Pixelmator Pro experience: Pixelmator Pro 1.0.4
: Boolean operations like Unite, Subtract, Intersect, and Exclude were added directly to the Arrange tool and the layer shortcut menu. : To combine shapes, select multiple vector layers
For a general overview of the Pixelmator Pro interface and its core features, you can watch this introductory guide: : To combine shapes