Creating a Mesh with the Bezier Shape tool
The Bezier Shape tool uses a Bezier spline (curve) and extrudes along it to create a 3D version of the curve. You fine-tune the shape by using the tangent handles on the control points to bend the shape.
To create a Mesh based on a bezier (curve) shape, select New Bezier Shape from the ProBuilder toolbar. The initial curve has two control points with tangent handles to control the curve's bend. By default, ProBuilder creates the curve in editing mode so you can continue to reshape it.
Tip: You can access this tool from the ProBuilder menu (Tools > ProBuilder > Editors > New Bezier Shape).