Send to Back will cause the stencil to be obscured by any stencil which overlaps it. Bring to Front will cause the stencil to obscure any stencil which it overlaps.
Enviar para o fondo fará que a figura sexa tapada por calquer outra que se lle sobrepoña. Traer para o Frente fará que a figura tape calquer outra coa que se solape.