diff --git a/packages/vkui/src/components/AppRoot/AppRootPortal.test.tsx b/packages/vkui/src/components/AppRoot/AppRootPortal.test.tsx
new file mode 100644
index 0000000000..43b3da72a1
--- /dev/null
+++ b/packages/vkui/src/components/AppRoot/AppRootPortal.test.tsx
@@ -0,0 +1,77 @@
+import * as React from 'react';
+import { render, screen } from '@testing-library/react';
+import { AppRoot, type AppRootProps } from './AppRoot';
+import { AppRootPortal, type AppRootPortalProps } from './AppRootPortal';
+
+function TestComponent({
+  appRootProps = {},
+  usePortal,
+}: {
+  appRootProps?: AppRootProps;
+  usePortal?: AppRootPortalProps['usePortal'];
+} = {}) {
+  const portalRootRef = React.useRef<HTMLDivElement | null>(null);
+
+  return (
+    <AppRoot portalRoot={portalRootRef} {...appRootProps}>
+      <AppRootPortal usePortal={usePortal}>
+        <div>content</div>
+      </AppRootPortal>
+      <div data-testid="portal-root" ref={portalRootRef} />
+    </AppRoot>
+  );
+}
+
+describe('AppRootPortal', () => {
+  it('does not use portal by default in full mode', () => {
+    render(<TestComponent appRootProps={{ mode: 'full' }} />);
+
+    expect(screen.getByTestId('portal-root').childElementCount).toBe(0);
+  });
+
+  it('uses portal in embedded mode', () => {
+    render(<TestComponent appRootProps={{ mode: 'embedded' }} />);
+
+    expect(screen.getByTestId('portal-root').childElementCount).toBe(1);
+  });
+
+  it('uses portal in partial mode', () => {
+    render(<TestComponent appRootProps={{ mode: 'partial' }} />);
+
+    expect(screen.getByTestId('portal-root').childElementCount).toBe(1);
+  });
+
+  it('does not use portal when portal is disabled in AppRoot', () => {
+    render(<TestComponent appRootProps={{ mode: 'partial', disablePortal: true }} />);
+
+    expect(screen.getByTestId('portal-root').childElementCount).toBe(0);
+  });
+
+  it('does not use portal when usePortal is false', () => {
+    render(<TestComponent appRootProps={{ mode: 'partial' }} usePortal={false} />);
+
+    expect(screen.getByTestId('portal-root').childElementCount).toBe(0);
+  });
+
+  it('uses portal in full mode when usePortal is true', () => {
+    render(<TestComponent appRootProps={{ mode: 'full' }} usePortal />);
+
+    expect(screen.getByTestId('portal-root').childElementCount).toBe(1);
+  });
+
+  it('uses portal passed via usePortal prop', () => {
+    const Wrapper = function Wrapper() {
+      const customPortalRef = React.useRef<HTMLDivElement | null>(null);
+      return (
+        <React.Fragment>
+          <TestComponent usePortal={customPortalRef} />
+          <div data-testid="custom-portal" ref={customPortalRef} />
+        </React.Fragment>
+      );
+    };
+    render(<Wrapper />);
+
+    expect(screen.getByTestId('portal-root').childElementCount).toBe(0);
+    expect(screen.getByTestId('custom-portal').childElementCount).toBe(1);
+  });
+});
diff --git a/packages/vkui/src/components/AppRoot/AppRootPortal.tsx b/packages/vkui/src/components/AppRoot/AppRootPortal.tsx
index 09fae8f506..eceef1bfc5 100644
--- a/packages/vkui/src/components/AppRoot/AppRootPortal.tsx
+++ b/packages/vkui/src/components/AppRoot/AppRootPortal.tsx
@@ -26,7 +26,7 @@ export const AppRootPortal = ({ children, usePortal }: AppRootPortalProps) => {
 
   const portalContainer = resolvePortalContainer(usePortal, portalRoot.current);
   if (!portalContainer || shouldDisablePortal(usePortal, mode, Boolean(disablePortal))) {
-    return children;
+    return <React.Fragment>{children}</React.Fragment>;
   }
 
   return createPortal(
@@ -47,7 +47,7 @@ function shouldDisablePortal(
     return disablePortal || usePortal !== true;
   }
   // fallback
-  return disablePortal || mode !== 'full';
+  return disablePortal || mode === 'full';
 }
 
 function resolvePortalContainer<PortalRootFromContext extends HTMLElement | null | undefined>(