The map area filled with the green color is called Rastro or Screen Painting and represents the area that was effectively applied during agricultural work.
For example, an area sown with soybeans, an area sprayed with pesticides, or even an area where fertilizer was distributed.
The area is filled according to the configured implement width (see Settings Menu / Job / Implement), which is graphically represented by the implement bar drawn behind the machine triangle.
When the Trace or Screen Paint is filled over an area still not applied, the tone of green of course. If the area is applied more than once, the tone of green will be darker at each new pass, indicating that there was a overlap.

The figures below show examples of a trail, in 3D and 2D perspectives.

Trace or Screen Painting – 3D Perspective

Trace or Screen Painting – 2D Perspective

Item Description
Represents the trail or screen painting made in the first pass.
Represents an area where passes overlapped.