To modify a layer, click over the graphic area to open a menu and choose a layer, or write its identification (name and number) on the Layer entry. To modify a list of layers, press the button List (after creating the list of layers with Layer->Select). Parameters for empty entries or Local choices remain unchanged.
To change a layer name write the new name in the Layer entry, followed by the layer number (GAMGI needs the number to identify the layer). To change the name for a list of layers, press List first and then write the new common name in the Name entry.
The visual representation of an object is always scaled by its own scale factor multiplied by the scale factor of all its parent objects until layer, inclusive.