diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0289b3078f0042600cac9249d6438d58608d5e29..c77e13c6520515372adddf3e3074dcc0f01e516b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@
 - 修复菜单项svg图标样式异常
 - 修复表格单击事件在双击时重复触发
 - 修复路由快速切换时，导航标签页显示异常
+- 修复工具栏首项+分组展开模式下，当行为组仅有两项时下拉未绘制
 
 ## [0.7.40-alpha.14] - 2025-04-24
 
diff --git a/src/control/toolbar/toolbar.tsx b/src/control/toolbar/toolbar.tsx
index 3a82689acd6b47becac9728618c96ebc00e0ede2..34f11385b2c78221d110c02b95f6802c63341621 100644
--- a/src/control/toolbar/toolbar.tsx
+++ b/src/control/toolbar/toolbar.tsx
@@ -396,9 +396,9 @@ export const ToolbarControl = defineComponent({
       details: IAppDEUIActionGroupDetail[],
       index: number,
     ): number => {
-      const firstItem: IParams = details.slice(index, 1);
-      if (firstItem[0]) {
-        if (c.state.buttonsState[firstItem[0].id!].visible) {
+      const firstItem: IParams = details[index];
+      if (firstItem) {
+        if (c.state.buttonsState[firstItem.id!]?.visible) {
           return index;
         }
         return getFirstIndex(details, index + 1);
@@ -413,9 +413,18 @@ export const ToolbarControl = defineComponent({
         const { uiactionGroupDetails } = uiactionGroup;
         const firstIndex = getFirstIndex(uiactionGroupDetails, 0);
         if (firstIndex !== -1) {
-          const firstItem = uiactionGroupDetails.slice(firstIndex, 1);
-          const remainders = uiactionGroupDetails.slice(firstIndex + 1);
-          const enableDropdown = remainders.length > 1;
+          const firstItem = uiactionGroupDetails[firstIndex];
+          // 获取剩余项截取位置下标，过滤掉不显示行为项后的下标
+          const remainderIndex = getFirstIndex(
+            uiactionGroupDetails,
+            firstIndex + 1,
+          );
+          // 如果剩余项下标存在，则截取行为组内剩余行为项
+          const remainders =
+            remainderIndex !== -1
+              ? uiactionGroupDetails.slice(remainderIndex)
+              : [];
+          const enableDropdown = remainders.length > 0;
           const groupButtonStyle = (item as IDETBGroupItem).buttonStyle || '';
           return (
             <el-dropdown
@@ -431,7 +440,7 @@ export const ToolbarControl = defineComponent({
               {{
                 default: () =>
                   renderActionButton(
-                    firstItem[0],
+                    firstItem,
                     convertBtnType(groupButtonStyle),
                   ),
                 dropdown: () =>