(Optional) Select the faces you want to simplify.You may want to
pre-select faces on large designs because it can be easier to simplify a
region at a time.
Click the Simplify tool.
(Optional) Click the Select Geometry tool guide to
select faces to simplify that aren't automatically detected.
Click the Complete tool guide to simplify all
highlighted faces.
Alternatively, click the Select Problem tool guide
and select a highlighted face to simplify that face. Hold the Ctrl key or
box select, to select multiple faces. Use the
Complete tool guide to simplify the selected
faces.