GGU-3D-SSFLOW: "Mesh" menu item
If you go to this menu item or click the tool in the toolbar, the FEM mesh is displayed as defined in "Mesh(x/y)/Preferences".
The active element layer and plane are shown in the Layer/plane legend in the top right corner of the screen. To select a different plane click the arrow buttons in the 3D toolbar.
If the mesh representation does not fill the screen, point to the "Auto-resize" menu item in the "Page size + margins" menu or press [F9].