GGU-3D-SSFLOW: "All" menu item
The following dialog box appears after selecting this menu item or, alternatively, pressing [F7]:

Either all elements or only element with certain material numbers can be refined. Here, too, potential boundary conditions can be taken into consideration (see "Mesh(x/y)/Refine individually" menu item). A description of the 3 refinement methods can also be found in that Section.