-<li><b>Id Elements</b> field allows to specify the elements which
-should be smoothed by selecting them in the 3D viewer (lock \b Shift
-button to select several elements).</li>
-<li><b>Select whole mesh, submesh or group</b> - smoothing is applied
-to the whole mesh or its part.</li>
-<li><b>Fixed nodes ids:</b> some nodes keep their location during
-smoothing. If a mesh is built on a geometry shape, the nodes built on
-geometrical edges are always fixed. If smoothing is applied to a part
-of a mesh then the boundary nodes of an elements set are also
-fixed. Any other nodes may be additionally fixed.</li>
-<li><b>Smoothing Method:</b>
+<li>specify the IDs of the elements which will be smoothed:
+<ul>
+<li><b>Select the whole mesh, submesh or group</b> activating this
+checkbox; or</li>
+<li>choose mesh elements with the mouse in the 3D Viewer. It is
+possible to select a whole area with a mouse frame; or</li>
+<li>input the element IDs directly in <b>ID Elements</b> field. The selected elements will be highlighted in the
+viewer; or</li>
+<li>apply Filters. <b>Set filter</b> button allows to apply a filter to the selection of elements. See more
+about filters in the \ref selection_filter_library_page "Selection filter library" page.</li>
+</ul>
+</li>
+
+<li>define the <b>Fixed nodes ids</b> that should remain at their location during
+smoothing. If a mesh is built on a shape, the nodes built on its
+geometric edges are always fixed. If the smoothing is applied to a part
+of the mesh, the nodes of boundary elements are also
+fixed. It is possible to additionally fix any other nodes. The fixed nodes can be
+selected manually or by filters, just as the smoothed elements.</li>
+<li>choose the <b>Smoothing Method:</b>