Use the Enhance Shapes tool
If you want your hand-drawn shapes to change to precise shapes, you can use the optional Enhance inked shapes automatically feature by enabling it in Settings.
When this is active, drawing a shape — such as a circle or square — will automatically change the hand-drawn ink strokes to a precise shape on your whiteboard.
Whiteboard’s shape conversion currently works for squares, rectangles, triangles, circles, hexagons, pentagons, and parallelograms.
You can use the Undo command if you want to revert to your original ink strokes for the last shape you drew.
Shapes cannot be erased but can be deleted by tapping on the shape and selecting the Trash Can icon from the Context menu or using the Delete key.
To stop automatically converting shapes from ink, turn off the Ink to Shape feature in Settings.
Use the ruler
The Whiteboard ruler makes it easy to draw straight lines on the canvas.
To move the ruler while it is visible, click and then drag the ruler with the mouse. To use the keyboard, click the ruler, and then move it with the arrow keys.
To change the ruler’s angle, hover over the ruler with the mouse pointer and then use the scroll wheel. Or select the ruler, and then hold the Alt key while you press any of the arrow keys on your keyboard.