Invert Visible Color Blocks switches the visibility of the color blocks so that those that were visible become hidden, and those that were hidden are displayed.
Note: This is a useful method to quickly turn off all color blocks. You can then use Draw Next Color, Draw Previous Color, or choose colors in the color worksheet.
Click the Invert Visible Color Blocks
button in the Control Strip.
Choose Filter > Invert Visible Color Blocks.