diff --git a/packages/graph-explorer/src/core/StateProvider/graphViewLayout.test.ts b/packages/graph-explorer/src/core/StateProvider/graphViewLayout.test.ts
index 71c7a1c470..f95affb22b 100644
--- a/packages/graph-explorer/src/core/StateProvider/graphViewLayout.test.ts
+++ b/packages/graph-explorer/src/core/StateProvider/graphViewLayout.test.ts
@@ -15,6 +15,7 @@ import {
 import {
   DEFAULT_SIDEBAR_WIDTH,
   DEFAULT_TABLE_VIEW_HEIGHT,
+  MIN_SIDEBAR_WIDTH,
 } from "./graphViewLayoutDefaults";
 
 const baseLayout: GraphViewLayout = {
@@ -167,6 +168,17 @@ describe("useGraphViewSidebar", () => {
     expect(result.current.sidebarWidth).toBe(DEFAULT_SIDEBAR_WIDTH - 100);
   });
 
+  it("should clamp sidebar width to the minimum on a large negative delta", () => {
+    const { result } = renderHookWithState(
+      () => useGraphViewSidebar(),
+      stateWithLayout(),
+    );
+
+    act(() => result.current.setSidebarWidth(-10000));
+
+    expect(result.current.sidebarWidth).toBe(MIN_SIDEBAR_WIDTH);
+  });
+
   it("should auto-open details when detailsAutoOpenOnSelection is true", () => {
     const { result } = renderHookWithState(
       () => useGraphViewSidebar(),
diff --git a/packages/graph-explorer/src/core/StateProvider/graphViewLayout.ts b/packages/graph-explorer/src/core/StateProvider/graphViewLayout.ts
index 3b95fc0bc4..b7d3981234 100644
--- a/packages/graph-explorer/src/core/StateProvider/graphViewLayout.ts
+++ b/packages/graph-explorer/src/core/StateProvider/graphViewLayout.ts
@@ -5,6 +5,7 @@ import { useQueryEngine } from "@/connections";
 import {
   DEFAULT_SIDEBAR_WIDTH,
   DEFAULT_TABLE_VIEW_HEIGHT,
+  MIN_SIDEBAR_WIDTH,
   type GraphViewSidebarItem,
   type ToggleableView,
 } from "./graphViewLayoutDefaults";
@@ -97,7 +98,10 @@ export function useGraphViewSidebar() {
       ...prev,
       sidebar: {
         ...prev.sidebar,
-        width: (prev.sidebar?.width ?? DEFAULT_SIDEBAR_WIDTH) + deltaWidth,
+        width: Math.max(
+          MIN_SIDEBAR_WIDTH,
+          (prev.sidebar?.width ?? DEFAULT_SIDEBAR_WIDTH) + deltaWidth,
+        ),
       },
     }));
   }
diff --git a/packages/graph-explorer/src/core/StateProvider/graphViewLayoutDefaults.ts b/packages/graph-explorer/src/core/StateProvider/graphViewLayoutDefaults.ts
index e34dd6804c..a04573fe90 100644
--- a/packages/graph-explorer/src/core/StateProvider/graphViewLayoutDefaults.ts
+++ b/packages/graph-explorer/src/core/StateProvider/graphViewLayoutDefaults.ts
@@ -36,6 +36,9 @@ export const legacyStylingSidebarItemSchema = z
 /** Default width for the graph view sidebar in pixels. */
 export const DEFAULT_SIDEBAR_WIDTH = 400;
 
+/** Floor for the sidebar width in pixels, so resizing cannot persist a non-positive width. */
+export const MIN_SIDEBAR_WIDTH = 200;
+
 /**
  * The Graph View Layout as the shared breadcrumb stores it, declared once so the
  * runtime type and the parser cannot drift apart. It accepts the shapes older
diff --git a/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.test.ts b/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.test.ts
index 94aab5b9d3..4d1d2e9228 100644
--- a/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.test.ts
+++ b/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.test.ts
@@ -5,7 +5,10 @@ import { describe, expect, it } from "vitest";
 
 import type { SchemaViewLayout } from "@/core/StateProvider/schemaViewLayoutDefaults";
 
-import { DEFAULT_SIDEBAR_WIDTH } from "@/core/StateProvider/graphViewLayoutDefaults";
+import {
+  DEFAULT_SIDEBAR_WIDTH,
+  MIN_SIDEBAR_WIDTH,
+} from "@/core/StateProvider/graphViewLayoutDefaults";
 import { DbState, renderHookWithState } from "@/utils/testing";
 
 import { useSchemaViewSidebar } from "./schemaViewLayout";
@@ -94,6 +97,17 @@ describe("useSchemaViewSidebar", () => {
     expect(result.current.sidebarWidth).toBe(DEFAULT_SIDEBAR_WIDTH - 50);
   });
 
+  it("should clamp sidebar width to the minimum on a large negative delta", () => {
+    const { result } = renderHookWithState(
+      () => useSchemaViewSidebar(),
+      stateWithLayout(),
+    );
+
+    act(() => result.current.setSidebarWidth(-10000));
+
+    expect(result.current.sidebarWidth).toBe(MIN_SIDEBAR_WIDTH);
+  });
+
   it("should auto-open details tab when enabled and selection changes", () => {
     const { result } = renderHookWithState(
       () => useSchemaViewSidebar(),
diff --git a/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.ts b/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.ts
index 77d62a08c1..ee137623ee 100644
--- a/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.ts
+++ b/packages/graph-explorer/src/modules/SchemaGraph/Sidebar/schemaViewLayout.ts
@@ -2,7 +2,10 @@ import { useAtom } from "jotai";
 
 import type { SchemaViewSidebarItem } from "@/core/StateProvider/schemaViewLayoutDefaults";
 
-import { DEFAULT_SIDEBAR_WIDTH } from "@/core/StateProvider/graphViewLayoutDefaults";
+import {
+  DEFAULT_SIDEBAR_WIDTH,
+  MIN_SIDEBAR_WIDTH,
+} from "@/core/StateProvider/graphViewLayoutDefaults";
 import { schemaViewLayoutAtom } from "@/core/StateProvider/storageAtoms";
 
 export type { SchemaViewSidebarItem } from "@/core/StateProvider/schemaViewLayoutDefaults";
@@ -30,7 +33,10 @@ export function useSchemaViewSidebar() {
       ...prev,
       sidebar: {
         ...prev.sidebar,
-        width: (prev.sidebar?.width ?? DEFAULT_SIDEBAR_WIDTH) + deltaWidth,
+        width: Math.max(
+          MIN_SIDEBAR_WIDTH,
+          (prev.sidebar?.width ?? DEFAULT_SIDEBAR_WIDTH) + deltaWidth,
+        ),
       },
     }));
   }