diff --git a/src/app/panels/columns/ColumnDrawer.cpp b/src/app/panels/columns/ColumnDrawer.cpp
index 41b5522..640eb5b 100644
--- a/src/app/panels/columns/ColumnDrawer.cpp
+++ b/src/app/panels/columns/ColumnDrawer.cpp
@@ -1,10 +1,14 @@
 #include "panels/columns/ColumnDrawer.hpp"
 #include "panels/columns/Column2DDataset.hpp"
 #include "panels/columns/CategoryAnalysisTab.hpp"
+#include <algorithm>
+
 #include "Glyphs.hpp"
 #include "Theme.hpp"
 #include <QHBoxLayout>
 #include <QPushButton>
+#include <QResizeEvent>
+#include <QTabBar>
 #include <QTabWidget>
 
 namespace geopro::app {
@@ -49,6 +53,20 @@ ColumnDrawer::ColumnDrawer(QWidget* parent, geopro::data::DatasetFieldDictionary
     setMaximumWidth(560);
 }
 
+void ColumnDrawer::resizeEvent(QResizeEvent* e)
+{
+    QWidget::resizeEvent(e);
+    // 两 tab 平分抽屉宽度填满（带样式表的 tab 不响应 setExpanding，须按 barWidth/n 显式给宽）。
+    //   消除旧 3 栏布局遗留的右侧空白——重构成 2 栏后不再三分、留空第三位。
+    if (auto* tabs = qobject_cast<QTabWidget*>(body_)) {
+        const int n = tabs->count();
+        if (n > 0 && tabs->width() > 0) {
+            const int w = std::max(40, tabs->width() / n - 6);  // 减 margin-right(4)余量
+            tabs->tabBar()->setStyleSheet(QStringLiteral("QTabBar::tab{width:%1px;}").arg(w));
+        }
+    }
+}
+
 void ColumnDrawer::toggleCollapsed()
 {
     collapsed_ = !collapsed_;
diff --git a/src/app/panels/columns/ColumnDrawer.hpp b/src/app/panels/columns/ColumnDrawer.hpp
index f75b5ac..bfadc73 100644
--- a/src/app/panels/columns/ColumnDrawer.hpp
+++ b/src/app/panels/columns/ColumnDrawer.hpp
@@ -2,6 +2,7 @@
 #include <QWidget>
 
 class QPushButton;
+class QResizeEvent;
 
 namespace geopro::data {
 class DatasetFieldDictionary;
@@ -26,6 +27,9 @@ public slots:
     void toggleCollapsed();
     void expand();  // 强制展开（进入全屏时确保三栏可见）
 
+protected:
+    void resizeEvent(QResizeEvent* e) override;  // 两 tab 按抽屉宽平分（消除右侧空白"第三栏位"）
+
 private:
     Column2DDataset* col2D_ = nullptr;
     CategoryAnalysisTab* analysisTab_ = nullptr;