I have finished the schematic layout for my design which contains transformer. I also found the optimized design 100%, but the transformer background should be black while I'm having only portion of it black, any idea on how to do it?
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Your polygon pour is filling in (showing as blue). To make your "background black" under the transformer, you need to change the shape of your polygon. When you created the polygon, you had to first draw the outline. All you have to do is click the outside edge of the pour and it should highlight the edges of the whole polygon. You can then drag the sides to change its shape.
Not sure why you don't want the pour under the transformer though. Assuming it's insulated with solder mask and your transformer is in a protective case, having the polygon pour completely shouldn't be a problem.
The blue under the transformer is a polygon (copper pour) in the bottom layer. You can change the polygon's geometry by dragging its corners. After you change the shape, the fill will disappear, and dotted line will show around the polygon. Click
Ratsnest on the toolbar, and the polygon will fill again.