Layer Walk allows you to use Filters. By using wildcards and letters you can select groups of layers for viewing. The check box tothe right allows you to turn on and off the filter.
You can also Purge layers…
You may have noticed a Purge button at the bottom of the dialog box. It is usually grayed out.
When the selected layers contain no objects, the PURGE button becomes operational. By selecting it you can purge the highlighted layers from the drawing. You may ask… “how do I know what layers are empty?” For a list of layers that can be purged, right-click anywhere in the Layer list and click “Select Unreferenced”. The unreferenced layers are then highlighted and you can purge them.