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In the Preview app
Use any of the following shape tools to select an area in an image and then crop, copy, or delete:
Rectangular Selection
Draw a shape using a single stroke. Press your finger more firmly on the trackpad to draw with a heavier, darker line.
Note: Unlike the Sketch tool, the Draw tool doesn’t recognize standard shapes.
This tool appears only on computers with a Force Touch trackpad.
Shapes
See what an image looks like on another device in Preview on MacUse the Touch Bar