To specify which CAD levels and surfaces are displayed in the CAD view:

to expand the folders and display the levels and objects you want to work with.
next to the entry you do not want to display in the CAD view; the icon changes to
and the icon of any parent level or object changes to
to indicate one or more sub-entries are hidden.In this example, the whole CAD model is displayed because all the level and object entries are selected:

with these selections, Face 1~5 and Face 1~78 in Level_1 are hidden:

To redisplay an entry in the CAD view, click the
icon again.