Purging elements  

From within the Explorer, you can eliminate unused blocks, layers, linetypes, text styles, dimension styles, or annotation scales from your drawing file. Purging unused elements can significantly reduce the drawing file size.

To purge an element

   1   Do one of the following to choose Explorer ():

    On the ribbon, choose Tools > Explorer (in Explorer).

    On the menu, choose Tools > Explorer.

    On the Tools toolbar, click the Explorer tool.

    Type explayers and then press Enter.

   2   Select the element from which you want to purge unreferenced elements.

   3   Choose Edit > Purge, or click the Purge tool ().