Element
All elements are hidden in case this checkbox is not selected. That
will make the element set translucent. Edges or vertices of elements are shown
if show-edges/vertices is selected.
Element Normal
Show/hide element normals. The element normals form a vector field
that is based on the element midpoints. This option is only available if
element normals has been assigned to this element set. To assign element
normals to this element set use Method-Apply-MakeElementNormals.
Edge
If activated the edges of elements are emphasized by colored lines as
given in color entries below.
Boundary
If the elements set has a border (this is a question of connectivity)
and this option is set the border is marked with a thick line.
Texture
If a texture image is assigned to this element set and texture
coordinates has been set then this option makes it visible/invisible.
Outline
Draws thick lines to mark the bounds of the current visible image of
the geometry in the display. If activated and elements are shown the option
'show elements' is deselected.