Select components and matching colors

Press V and click inside a shape to select the fill, or on its edge to select the outline. Shift combines selections. Double click selects the whole shape. Deleting only the fill preserves the outline.

Edit → Select same color expands the selection within the active layer and frame, matching exact color and opacity. Fills match fills; outlines match outlines.

Press Q to transform. Shift constrains proportions or rotation; Alt uses the center. Modify commands align, distribute and combine vectors.