diff --git a/src/course-home/progress-tab/grades/grade-summary/GradeSummaryHeader.jsx b/src/course-home/progress-tab/grades/grade-summary/GradeSummaryHeader.jsx
index df1ff65836..47b9ff8c33 100644
--- a/src/course-home/progress-tab/grades/grade-summary/GradeSummaryHeader.jsx
+++ b/src/course-home/progress-tab/grades/grade-summary/GradeSummaryHeader.jsx
@@ -1,3 +1,4 @@
+import { useState } from 'react';
 import PropTypes from 'prop-types';
 import { useIntl } from '@edx/frontend-platform/i18n';
 import {
@@ -6,12 +7,13 @@ import {
   OverlayTrigger,
   Stack,
   Tooltip,
+  IconButton,
 } from '@openedx/paragon';
 import { InfoOutline, Locked } from '@openedx/paragon/icons';
-import { useContextId } from '../../../../data/hooks';
 
+import { useContextId } from '@src/data/hooks';
+import { useModel } from '@src/generic/model-store';
 import messages from '../messages';
-import { useModel } from '../../../../generic/model-store';
 
 const GradeSummaryHeader = ({ allOfSomeAssignmentTypeIsLocked }) => {
   const intl = useIntl();
@@ -20,24 +22,36 @@ const GradeSummaryHeader = ({ allOfSomeAssignmentTypeIsLocked }) => {
     verifiedMode,
     gradesFeatureIsFullyLocked,
   } = useModel('progress', courseId);
+  const [showTooltip, setShowTooltip] = useState(false);
+
+  const handleKeyDown = (event) => {
+    if (event.key === 'Escape') {
+      setShowTooltip(false);
+    }
+  };
 
   return (
     <Stack gap={2} className="mb-3">
       <Stack direction="horizontal" gap={2}>
         <h3 className="h4 m-0">{intl.formatMessage(messages.gradeSummary)}</h3>
         <OverlayTrigger
-          trigger="hover"
+          trigger="click"
           placement="top"
+          show={showTooltip}
           overlay={(
             <Tooltip>
               {intl.formatMessage(messages.gradeSummaryTooltipBody)}
             </Tooltip>
           )}
         >
-          <Icon
+          <IconButton
+            onClick={() => setShowTooltip(!showTooltip)}
+            onBlur={() => setShowTooltip(false)}
+            onKeyDown={handleKeyDown}
             alt={intl.formatMessage(messages.gradeSummaryTooltipAlt)}
-            src={InfoOutline}
+            iconAs={InfoOutline}
             size="sm"
+            disabled={gradesFeatureIsFullyLocked}
           />
         </OverlayTrigger>
       </Stack>
diff --git a/src/course-home/progress-tab/grades/grade-summary/GradeSummaryHeader.test.jsx b/src/course-home/progress-tab/grades/grade-summary/GradeSummaryHeader.test.jsx
new file mode 100644
index 0000000000..cdd3ca1af3
--- /dev/null
+++ b/src/course-home/progress-tab/grades/grade-summary/GradeSummaryHeader.test.jsx
@@ -0,0 +1,125 @@
+import userEvent from '@testing-library/user-event';
+import { useSelector } from 'react-redux';
+
+import { useModel } from '@src/generic/model-store';
+import {
+  initializeMockApp, render, screen, waitFor,
+} from '@src/setupTest';
+import GradeSummaryHeader from './GradeSummaryHeader';
+import messages from '../messages';
+
+jest.mock('react-redux', () => ({
+  useSelector: jest.fn(),
+}));
+
+jest.mock('@src/generic/model-store', () => ({
+  useModel: jest.fn(),
+}));
+
+jest.mock('@src/data/hooks', () => ({
+  useContextId: () => 'test-course-id',
+}));
+
+describe('GradeSummaryHeader', () => {
+  beforeAll(() => {
+    initializeMockApp();
+  });
+
+  beforeEach(() => {
+    useSelector.mockImplementation((selector) => selector({
+      courseHome: { courseId: 'test-course-id' },
+    }));
+    useModel.mockReturnValue({ gradesFeatureIsFullyLocked: false });
+  });
+
+  const renderComponent = (props = {}) => {
+    render(
+      <GradeSummaryHeader
+        allOfSomeAssignmentTypeIsLocked={false}
+        {...props}
+      />,
+    );
+  };
+
+  it('shows tooltip on icon button click', async () => {
+    renderComponent();
+
+    const iconButton = screen.getByRole('button', {
+      name: messages.gradeSummaryTooltipAlt.defaultMessage,
+    });
+
+    await userEvent.click(iconButton);
+
+    await waitFor(() => {
+      expect(screen.getByText(messages.gradeSummaryTooltipBody.defaultMessage)).toBeInTheDocument();
+    });
+  });
+
+  it('hides tooltip on click', async () => {
+    renderComponent();
+
+    const iconButton = screen.getByRole('button', {
+      name: messages.gradeSummaryTooltipAlt.defaultMessage,
+    });
+
+    await userEvent.click(iconButton);
+
+    await waitFor(() => {
+      expect(screen.getByText(messages.gradeSummaryTooltipBody.defaultMessage)).toBeVisible();
+    });
+
+    await userEvent.click(iconButton);
+
+    await waitFor(() => {
+      expect(screen.queryByText(messages.gradeSummaryTooltipBody.defaultMessage)).toBeNull();
+    });
+  });
+
+  it('hides tooltip on blur', async () => {
+    renderComponent();
+
+    const iconButton = screen.getByRole('button', {
+      name: messages.gradeSummaryTooltipAlt.defaultMessage,
+    });
+
+    await userEvent.hover(iconButton);
+    await userEvent.click(iconButton);
+
+    await waitFor(() => {
+      expect(screen.getByText(messages.gradeSummaryTooltipBody.defaultMessage)).toBeInTheDocument();
+    });
+
+    const blurTarget = document.createElement('button');
+    blurTarget.textContent = 'Outside';
+    document.body.appendChild(blurTarget);
+
+    await userEvent.click(blurTarget);
+
+    await waitFor(() => {
+      expect(screen.queryByText(messages.gradeSummaryTooltipBody.defaultMessage)).not.toBeInTheDocument();
+    });
+
+    document.body.removeChild(blurTarget);
+  });
+
+  it('hides tooltip when Escape is pressed (covers handleKeyDown)', async () => {
+    renderComponent();
+
+    const iconButton = screen.getByRole('button', {
+      name: messages.gradeSummaryTooltipAlt.defaultMessage,
+    });
+
+    await userEvent.hover(iconButton);
+    await userEvent.click(iconButton);
+
+    await waitFor(() => {
+      expect(screen.getByText(messages.gradeSummaryTooltipBody.defaultMessage)).toBeInTheDocument();
+    });
+
+    await userEvent.keyboard('{Escape}');
+
+    await waitFor(() => {
+      expect(screen.queryByText(messages.gradeSummaryTooltipBody.defaultMessage)).not.toBeInTheDocument();
+    });
+  });
+});