Afaik it doesn't do that on its own, is the outline part of the export from your CAD?
The board layout is 100x70mm I guess the gerbers have an absolute dimension for the board size, all I want to do is remove the external dimensions of the board from the layout, without resorting to the hacks i am currently using. [New Bitmap Image](//muut.com/u/flatcam/s1/:flatcam:B1Bn:newbitmapimage.jpg.jpg)
You can see in the image, it runs the outer of the board layout, which i would like it to ignore and only cut the tracks and cutouts
Ok does not do it if i remove the copper groundplane