When a geometry is selected, its bounding box is displayed.

Bounding boxes also have control points.

Unlike editing control points on the geometry, the bounding box is always a set rectangular ratio that encompasses the entire geometry.

To scale a geometry without changing its relative shape & corner angles, use the corner control points on the bounding box.

Click and drag a bounding box corner to scale.

While you drag a corner, type a number to set an exact width or depth. Press Tab to switch between width and depth. Hold Shift to scale proportionally, then type a ratio. Hold Option/Alt to resize from the center. With Classic draw mode on, the number you type sets the ratio.

To stretch a geometry in one direction without keeping the relative shape or corner angles intact, use the midpoints on the bounding box.

Click and drag a bounding box midpoint to stretch.

While you drag a midpoint, type a number to set that side's exact length. Hold Option/Alt to stretch from the center.