-<li><b>Faces without layers</b> - defines geometrical faces on which
-prism layers should not be constructed. By default the prism layers
-are not constructed on geometrical faces shared by solids.</li>
+<li><b>Faces (Edges) without layers</b> - defines geometrical faces
+ (or edges in 2D) on which element layers should not be
+ constructed. By default the element layers are not constructed on
+ geometrical faces shared by solids (and edges shared by faces in 2D).
+ \note A mesh shown in the 3D Viewer can prevent selection of faces
+ and edges, in this case just hide the mesh. To avoid a long wait when a
+ geometry with many faces (or edges) is displayed, the number of faces
+ (edges) shown at a time is limited by the value of "Sub-shapes
+ preview chunk size" preference (in Preferences/Mesh/General tab).
+</li>