Open myPoint menu and move the All-screens shade slider.
The "Shade" checkbox will toggle on automatically.

In a multi-monitor environment, the All-screens shade will not be enough. It should be combined with Per-screen shade. Please follow the steps below:

• Tune up the All-screens shade until you get the best picture at the primary monitor;
• Tune up Per-screen shades for other monitors.

The assistant is OFF by default. Because of this, the shade should be switched ON and OFF manually.
If you prefer the shade to toggle automatically, please select the "Shade assistant" checkbox and fill the application list appropriately.

More about the shade assistant you can find in the Intermediate tutorial.
Note: In versions prior 1.13, the assistant was ON by default.