Hello Tuan, There can be various ways to deal with this situation and save some time by doing labels modification from scratch. You can use modify label tools option to edit leaders for labels. Also while cleaning up the DGN file, you can extract the modified iso drawing in different output format which regenrating. Check wiki for details. You may follow same approach and could save some time using Isoextractor tool. Also you can manage it through level dipslay manager by checking it off. See image below. HTH, -Regards | Rahul Kumar
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