# DIMSE1 System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).md) → [D](Help%20System/GSTARCAD/2026/System%20Variables/D/(D).md) ## Function Description: The DIMSE1 system variable is used to control whether to hide the first extension line. | | | | --- | --- | | Type | Parameter | | Saved in | Drawing | | Initial value | Off | ## System Variable Value: **Off:** display the extension line **On:** hide the extension line --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables_Dgsv/DIMSE1.html) · © Gstarsoft Co., Ltd.