JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. To Delete a Toolbox In the Customize dialog ( File > Settings > Configuration > Customize ) , click the Tools tab. Expand the User Tools section and expand the open DGN file. Select the toolbox that you want to delete. Do one of the following: Click the Delete icon. orRight-click the toolbox and select Delete from the pop-up menu. orPress the <Delete> key. Parent topic: Working with Custom Toolboxes