Extension Warehouse > Search “2D Tools” > Install via SketchUp’s Extension Manager.

Once you’ve found the right , follow these steps to install it:

Standard SketchUp tools often struggle with complex 2D operations like "z-fighting" (when lines overlap on the same plane) or creating complex fillets and offsets. 2D-specific plugins allow you to: Ensure all lines stay on the Z=0 axis.

2D Line, 2D Rectangle, 2D Circle, 2D Polyline, 2D Fillet, and 2D Trim/Extend.