JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. To Delete All Unused Levels Do one of the following: In the Level Manager dialog, from the Edit menu, choose Select All. orRight-click in the level list, then choose Select All. orPress <Ctrl+A>. Do one of the following: Press the <Delete> key. orFrom the Edit menu, choose Delete. orRight-click and choose Delete from the pop-up menu. All unused levels are deleted from the open DGN file. Used levels remain unchanged. Note: You can also delete all unused levels with the Key-in DELETE UNUSED LEVELS. Parent topic: Creating and Deleting Levels