Section Shadow Invisible 
Make a Shadow Invisible
Use the Section Shadow Invisible option to control the primary section shadows of all visible objects. This is useful when there are a large number of objects or layers and you don't want to accidentally pick and edit the wrong object.
This option can also be accessed by clicking the Section Shadow Invisible button
on the Visibility toolbar.
Instructions
On the View menu, point to Visibility, and then click Section Shadow Invisible.
The Select By dialog box is then displayed, allowing you to select the items by layer or object.
The selected objects shadows are then made invisible.
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