# Underlay Layers Dialog Box [GstarCAD 2025](Help%20System/GSTARCAD/2025/Index.md) → [Commands](Help%20System/GSTARCAD/2025/Commands/(Commands).md) **Function Description:** Controls the display of layers in a DGN underlay. ![](Help%20System/GSTARCAD/2025/assets/86f83bd14b142afbff8e92cc78c16dee4d787751bf61267d4db425e844317cb9.jpg) ``` 　 ``` --- [Original help](https://www.gstarcad.net/help/GstarCAD_2025_en-US/detail/commandReferences/DGNLAYERS_DIA.html) · © Gstarsoft Co., Ltd.