# PREVIEWTYPE System Variable [GstarCAD 2026](Help%20System/GSTARCAD/2026/Index.md) → [System Variables](Help%20System/GSTARCAD/2026/System%20Variables/(System%20Variables).md) → [P](Help%20System/GSTARCAD/2026/System%20Variables/P/(P).md) ## Function Description: The PREVIEWTYPE system variable is used to control which viewport will use the drawing thumbnail preview. | | | | --- | --- | | Type | Integer | | Saved in | Drawing | | Initial value | 0 | | Range | 0,1 | ## System Variable Value: **0:** use last saved view **1:** use the main view --- [Original help](https://www.gstarcad.net/help/GstarCAD_2026_en-US/detail/systemVariables/PREVIEWTYPE.html) · © Gstarsoft Co., Ltd.