You can change the color mode with the canvas tool.
This is convenient when you want to switch from color to monochrome illustration production such as manga.
Open the ①Tool Select window and select the ②Canvas tool.
Select ①Color Mode.
Select any color mode from ①Color Mode.
This time, select ②Gray Scale.
The color mode of the canvas has changed to Gray Scale.
When Black & White is selected, it changes in this way.
We are done.