Click on one of the squares to select the eraser size. You can select from squares of side length 2, 3, 5, 9, 17 and 29 pixels.

The eraser size setting affects the Erasers.

Click on one of the lines to select the line width. You can select from line widths of 1, 2, 3, 5 and 8 pixel(s).

The line width setting affects the Connected Lines, Curve, Ellipse, Line, Polygon, Rectangle and Rounded Rectangle tools.

Click on one of the rectangles to select the fill style. You can select from No Fill, Fill with Background Color and Fill with Foreground Color.

The fill style setting affects the Ellipse, Polygon, Rectangle and Rounded Rectangle tools.