# SURFACEASSOCIATIVITYDRAG System Variable [GstarCAD 2020](Help%20System/GSTARCAD/2020/Index.md) → [System Variables](Help%20System/GSTARCAD/2020/System%20Variables/(System%20Variables).md) → [S](Help%20System/GSTARCAD/2020/System%20Variables/S/(S).md) ## Function Description: The SURFACEASSOCIATIVITYDRAG system variable is used to set the dragging preview behavior of associated surfaces. | | | | --- | --- | | Type | Parameter | | Saved in | Drawing | | Initial value | 1 | | Range | 0,1,2 | This system variable could control the surface preview method of surfaces or all associated surfaces when dragging a selected surface. Disabling preview could enhance performance. ## System Variable Value: **0:** do not display preview. It will refresh after dragging. **1:** only preview the first associated surface dragging. All other associated surface will not move after dragging. **2:** preview all associated surfaces dragging. --- ## Other versions with matching text [GstarCAD 2016](../../../2016/System%20Variables/S/SURFACEASSOCIATIVITYDRAG%20System%20Variable.md) · [GstarCAD 2017](Help%20System/GSTARCAD/2017/System%20Variables/S/SURFACEASSOCIATIVITYDRAG%20System%20Variable.md) · [GstarCAD 2018](Help%20System/GSTARCAD/2018/System%20Variables/S/SURFACEASSOCIATIVITYDRAG%20System%20Variable.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/System%20Variables/S/SURFACEASSOCIATIVITYDRAG%20System%20Variable.md) · [GstarCAD 2021](Help%20System/GSTARCAD/2021/System%20Variables/S/SURFACEASSOCIATIVITYDRAG%20System%20Variable.md)