diff --git a/apps/web/src/components/DiagramEditorPane.test.mjs b/apps/web/src/components/DiagramEditorPane.test.mjs
index 2672f035..fb838590 100644
--- a/apps/web/src/components/DiagramEditorPane.test.mjs
+++ b/apps/web/src/components/DiagramEditorPane.test.mjs
@@ -115,6 +115,7 @@ describe("diagram editor canvas surface", () => {
   test("organizes architecture resources in a searchable category library", () => {
     expect(source).toContain("ARCHITECTURE_LIBRARY_CATEGORIES");
     expect(source).toContain('t("diagram.componentLibrary")');
+    expect(source).toContain('onPointerEnter={() => setOpen(true)}');
     expect(source).toContain('t("diagram.componentSearch")');
     expect(source).toContain('labelKey: "diagram.componentCategoryExperience"');
     expect(source).toContain('labelKey: "diagram.componentCategoryServices"');
@@ -141,6 +142,16 @@ describe("diagram editor canvas surface", () => {
     expect(source).not.toContain('className="line-clamp-2"');
   });
 
+  test("opens every diagram insertion library immediately on pointer hover", () => {
+    expect(source).toContain("const DiagramInsertMenu = ({");
+    expect(source.match(/onPointerEnter=\{\(\) => setOpen\(true\)\}/g)?.length).toBe(2);
+    expect(source).toContain('label={t("diagram.addTopic")}');
+    expect(source).toContain('label: t("diagram.addSiblingTopic")');
+    expect(source).toContain('label={t("diagram.addStep")}');
+    expect(source).toContain('label: t("diagram.addDecision")');
+    expect(source).toContain('label: t("diagram.addTerminator")');
+  });
+
   test("shows connection handles only on selected flowchart nodes", () => {
     expect(globalStyles).toContain('.x6-node.edgeever-flow-node-active .edgeever-flow-port-dot');
     expect(globalStyles).toContain('.x6-port-body:hover .edgeever-flow-port-dot');
diff --git a/apps/web/src/components/DiagramEditorPane.tsx b/apps/web/src/components/DiagramEditorPane.tsx
index 4e3ac4d7..0be4b7c6 100644
--- a/apps/web/src/components/DiagramEditorPane.tsx
+++ b/apps/web/src/components/DiagramEditorPane.tsx
@@ -322,7 +322,9 @@ const ArchitectureComponentLibrary = ({
       if (!nextOpen) setQuery("");
     }}>
       <DropdownMenuTrigger asChild>
-        <Button size="sm" variant="outline"><Boxes className="h-4 w-4" />{t("diagram.componentLibrary")}</Button>
+        <Button size="sm" variant="outline" onPointerEnter={() => setOpen(true)}>
+          <Boxes className="h-4 w-4" />{t("diagram.componentLibrary")}
+        </Button>
       </DropdownMenuTrigger>
       <DropdownMenuContent align="start" className="max-h-[min(36rem,calc(100vh-8rem))] w-[min(30rem,calc(100vw-2rem))] overflow-y-auto p-0">
         <div className="sticky top-0 z-10 border-b border-slate-200 bg-white p-2.5">
@@ -385,6 +387,40 @@ const ArchitectureComponentLibrary = ({
   );
 };
 
+const DiagramInsertMenu = ({
+  icon: TriggerIcon,
+  items,
+  label,
+}: {
+  icon: LucideIcon;
+  items: Array<{ icon: LucideIcon; label: string; onSelect: () => void }>;
+  label: string;
+}) => {
+  const [open, setOpen] = useState(false);
+  return (
+    <DropdownMenu open={open} onOpenChange={setOpen}>
+      <DropdownMenuTrigger asChild>
+        <Button size="sm" variant="soft" onPointerEnter={() => setOpen(true)}>
+          <TriggerIcon className="h-4 w-4" />
+          {label}
+          <ChevronDown className="h-3.5 w-3.5 text-slate-400" />
+        </Button>
+      </DropdownMenuTrigger>
+      <DropdownMenuContent align="start">
+        {items.map((item) => {
+          const Icon = item.icon;
+          return (
+            <DropdownMenuItem key={item.label} onSelect={item.onSelect}>
+              <Icon className="h-4 w-4" />
+              {item.label}
+            </DropdownMenuItem>
+          );
+        })}
+      </DropdownMenuContent>
+    </DropdownMenu>
+  );
+};
+
 const FLOW_ACTIVE_NODE_CLASS = "edgeever-flow-node-active";
 const FLOW_PORT_HIT_RADIUS = 14;
 const FLOW_PORT_DOT_RADIUS = 7;
@@ -2074,12 +2110,14 @@ export const DiagramEditorPane = ({
         <div className="flex shrink-0 flex-wrap items-center gap-1 border-b border-slate-200 bg-white px-3 py-2">
           {!readOnly && (
             document.kind === "mind-map" ? (
-              <Tooltip>
-                <TooltipTrigger asChild>
-                  <Button size="sm" variant="soft" onClick={() => addNode("topic")}><GitBranch className="h-4 w-4" />{t("diagram.addTopic")}</Button>
-                </TooltipTrigger>
-                <TooltipContent>{t("diagram.mindMapShortcuts")}</TooltipContent>
-              </Tooltip>
+              <DiagramInsertMenu
+                icon={GitBranch}
+                label={t("diagram.addTopic")}
+                items={[
+                  { icon: GitBranch, label: t("diagram.addTopic"), onSelect: () => addNode("topic", { relation: "child" }) },
+                  { icon: ListTree, label: t("diagram.addSiblingTopic"), onSelect: () => addNode("topic", { relation: "sibling" }) },
+                ]}
+              />
             ) : document.kind === "architecture" ? (
               <>
                 <ArchitectureComponentLibrary
@@ -2093,14 +2131,15 @@ export const DiagramEditorPane = ({
               </>
             ) : (
               <>
-                <Tooltip>
-                  <TooltipTrigger asChild>
-                    <Button size="sm" variant="soft" onClick={() => addNode("process")}><Box className="h-4 w-4" />{t("diagram.addStep")}</Button>
-                  </TooltipTrigger>
-                  <TooltipContent>{t("diagram.flowchartShortcuts")}</TooltipContent>
-                </Tooltip>
-                <Tooltip><TooltipTrigger asChild><Button size="sm" variant="ghost" aria-label={t("diagram.addDecision")} onClick={() => addNode("decision")}><Diamond className="h-4 w-4" /></Button></TooltipTrigger><TooltipContent>{t("diagram.addDecision")}</TooltipContent></Tooltip>
-                <Tooltip><TooltipTrigger asChild><Button size="sm" variant="ghost" aria-label={t("diagram.addTerminator")} onClick={() => addNode("terminator")}><Circle className="h-4 w-4" /></Button></TooltipTrigger><TooltipContent>{t("diagram.addTerminator")}</TooltipContent></Tooltip>
+                <DiagramInsertMenu
+                  icon={Box}
+                  label={t("diagram.addStep")}
+                  items={[
+                    { icon: Box, label: t("diagram.addStep"), onSelect: () => addNode("process") },
+                    { icon: Diamond, label: t("diagram.addDecision"), onSelect: () => addNode("decision") },
+                    { icon: Circle, label: t("diagram.addTerminator"), onSelect: () => addNode("terminator") },
+                  ]}
+                />
                 <span className="hidden items-center gap-1.5 px-2 text-xs text-slate-500 xl:flex"><Link2 className="h-3.5 w-3.5" />{t("diagram.connectHint")}</span>
               </>
             )
diff --git a/packages/shared/src/i18n/en-US.ts b/packages/shared/src/i18n/en-US.ts
index e96aed5b..a5e7a7b6 100644
--- a/packages/shared/src/i18n/en-US.ts
+++ b/packages/shared/src/i18n/en-US.ts
@@ -250,6 +250,7 @@ export const enUS = {
     title: "Diagram title",
     canvas: "{{type}} canvas",
     addTopic: "Add child topic",
+    addSiblingTopic: "Add sibling topic",
     mindMapShortcuts: "Tab adds a child; Enter adds a sibling",
     addStep: "Add step",
     flowchartShortcuts: "Tab connects the next node; Enter edits; Cmd/Ctrl+D duplicates; arrow keys nudge",
diff --git a/packages/shared/src/i18n/zh-CN.ts b/packages/shared/src/i18n/zh-CN.ts
index b63975da..431f0f15 100644
--- a/packages/shared/src/i18n/zh-CN.ts
+++ b/packages/shared/src/i18n/zh-CN.ts
@@ -250,6 +250,7 @@ export const zhCN = {
     title: "图表标题",
     canvas: "{{type}}画布",
     addTopic: "添加子主题",
+    addSiblingTopic: "添加同级主题",
     mindMapShortcuts: "Tab 添加子主题，Enter 添加同级主题",
     addStep: "添加步骤",
     flowchartShortcuts: "Tab 连接后续节点，Enter 编辑，⌘/Ctrl+D 复制，方向键微调",