Empty Layers - Displays a list of layers in the active drawing sheet which contain no objects.
Select All - Selects all layers in the Empty Layers list. By default, all layers are selected when you first open the dialog box.
Clear All - De-selects all the layers in the Empty Layers list so that none of them are removed when you click OK.
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The dialog box will not list the Active Layer (if it does not contain any data) as a layer that can be deleted.
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The dialog box displays only when empty layers exist in the active drawing sheet. If no empty layers exist, the following message is displayed instead: