# DIMFXLON 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 DIMFXLON system variable is used to control whether to set a constant value for extension line. | | | | --- | --- | | Type | Parameter | | Saved in | Drawing | | Initial value | off | When DIMFXLON is on, the length of extension line is specified by DIMFXL system variable. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables_Dgsv/DIMFXLON.html) · © Gstarsoft Co., Ltd.