# DIMFXLON System Variable [GstarCAD 2017](Help%20System/GSTARCAD/2017/Index.md) → [System Variables](Help%20System/GSTARCAD/2017/System%20Variables/(System%20Variables).md) → [D](Help%20System/GSTARCAD/2017/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. --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/D/DIMFXLON%20System%20Variable--4cba01f0e491.md) · [GstarCAD 2018](../../../2018/System%20Variables/D/DIMFXLON%20System%20Variable--4cba01f0e491.md) · [GstarCAD 2019](../../../2019/System%20Variables/D/DIMFXLON%20System%20Variable--4cba01f0e491.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/System%20Variables/D/DIMFXLON%20System%20Variable--4cba01f0e491.md) · [GstarCAD 2021](../../../2021/System%20Variables/D/DIMFXLON%20System%20Variable--4cba01f0e491.md) · [GstarCAD 2022](Help%20System/GSTARCAD/2022/System%20Variables/D/DIMFXLON%20System%20Variable--4cba01f0e491.md)