Mar bez gweredekaet e vo hewel riblenn an dreuzfollenn dre ziouer. (Diw)Gweredekaet e vez ivez dre an arc'had "Skrammañ->Diskouez riblenn an dreuzfollenn".
When enabled, the layer boundary is visible by default. This can also be toggled with the "View->Show Layer Boundary" command.