The Swatches panel contains a collection of frequently used colors. Select a color from the collection by clicking the left mouse button, and it will be set as the main color. Press the right mouse button to access the panel settings, which duplicate the functions of the buttons at the bottom of the panel.
The empty squares at the top right area of the panel are used to save frequently used colors. To fill a cell, drag the main color to the panel. Left-click the cell to replace the main color with the specified one, right-click the cell to remove the current color.
The commands from the context menu and the buttons at the bottom of the panel have the following uses: