# DIMSD1 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 DIMSD1 system variable is used to control whether to hide the fist dimension line and arrowhead. | | | | --- | --- | | Type | Parameter | | Saved in | Drawing | | Initial value | Off | If this system variable set to on, it hides the extension line and arrowhead between the first extension line and text. ## System Variable Value: **Off:** display the first dimension line **On:** hide the first dimension line --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables_Dgsv/DIMSD1.html) · © Gstarsoft Co., Ltd.