diff --git a/src/app/panels/columns/ColumnDrawer.cpp b/src/app/panels/columns/ColumnDrawer.cpp
index 6571228..9a62f65 100644
--- a/src/app/panels/columns/ColumnDrawer.cpp
+++ b/src/app/panels/columns/ColumnDrawer.cpp
@@ -62,4 +62,9 @@ void ColumnDrawer::toggleCollapsed()
     setMaximumWidth(collapsed_ ? 18 : 318);
 }
 
+void ColumnDrawer::expand()
+{
+    if (collapsed_) toggleCollapsed();  // 仅在折叠时展开
+}
+
 }  // namespace geopro::app
diff --git a/src/app/panels/columns/ColumnDrawer.hpp b/src/app/panels/columns/ColumnDrawer.hpp
index d45c84d..500e88f 100644
--- a/src/app/panels/columns/ColumnDrawer.hpp
+++ b/src/app/panels/columns/ColumnDrawer.hpp
@@ -21,6 +21,7 @@ public:
 
 public slots:
     void toggleCollapsed();
+    void expand();  // 强制展开（进入全屏时确保三栏可见）
 
 private:
     Column3DDataset* col3D_ = nullptr;