Paint > PaintSymmetry > Modify Canvas Brush Symmetry

To use bilateral symmetry

In the option box, set Symmetry Type to Bilateral
The axis of symmetry appears as a dotted line.
Modify the axis in the following ways:
- Drag the central red dot to move the axis.
- Drag a red double-arrow to change the orientation of the axis. The axis rotates around the other double-arrow.
- Move the double-arrows along the axis to change the rotation pivots.
- Click the Reset button at the bottom of the window to reset the axis to its original position.
Select any brush and start sketching.
Everything you sketch on one side of the axis automatically gets drawn on the other side, as a mirror image.

To use radial symmetry

In the option box, set Symmetry type to Radial, and Num Radial Sections to the number of sections.
A number of axes of symmetry (equal to the value of Num Radial Sections) appear as dotted lines radially emanating from a center point.
Modify the axes in the following ways:
- Drag the central red dot to move the center point.
- Drag the red double-arrow to change the orientation of the axes (by rotating them around the center point).
- Click the Reset button at the bottom of the window to reset the axes to their original position.
Select any brush and start sketching.
Everything you sketch within one of the sections automatically gets drawn in all the other sections, creating a kaleidoscopic effect.

To stop sketching symmetrically

Do one of the following to toggle off symmetry:

Canvas Brush Symmetry Control

Symmetry Active: Check/uncheck this option to turn symmetrical sketching on or off.
Symmetry Type: Bilateral – Defines an axis (straight line) on the canvas which acts as the “mirror”.

Radial – Defines a number of lines emanating radially from a center point. They divide the canvas into a number of sections, each mirroring everything drawn in any of the other sections.
Num Radial Sections: Specifies the number of sections defined by the radial lines when Symmetry Type is set to Radial.