# SURFACEASSOCIATIVITYDRAG System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).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 can control the surface preview method of surfaces or all associated surfaces when dragging a selected surface. Disabling preview can 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. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables/SURFACEASSOCIATIVITYDRAG.html) · © Gstarsoft Co., Ltd.