English Traanslation
To get the gradient you need
1 Select the number under the rectangle - this is the duration of the pulse
2 Right-click on the rectangle and select a color in the drop-down menu (a click in the center of the rectangle changes the whole color, a click close to the border of the rectangle adds a smooth color transition from the selected edge to the center)
3 "+" "x" add (remove) a new rectangle, the arrow shows the starting rectangle when using several elements in the color display.
More experiments and everything will turn out, good luck!