diff --git a/scm-ui/ui-components/src/buttons/OpenInFullscreenButton.tsx b/scm-ui/ui-components/src/buttons/OpenInFullscreenButton.tsx
index 70d4ee5ead..707e86055e 100644
--- a/scm-ui/ui-components/src/buttons/OpenInFullscreenButton.tsx
+++ b/scm-ui/ui-components/src/buttons/OpenInFullscreenButton.tsx
@@ -26,10 +26,12 @@ import { FC, ReactNode, useState } from "react";
 import { useTranslation } from "react-i18next";
 import styled from "styled-components";
 import FullscreenModal from "../modals/FullscreenModal";
+import Tooltip from "../Tooltip";
 
 type Props = {
   modalTitle: string;
   modalBody: ReactNode;
+  useTitleTooltip?: boolean; // not recommended
 };
 
 const Button = styled.a`
@@ -39,13 +41,14 @@ const Button = styled.a`
   }
 `;
 
-const OpenInFullscreenButton: FC<Props> = ({ modalTitle, modalBody }) => {
+const OpenInFullscreenButton: FC<Props> = ({ modalTitle, modalBody, useTitleTooltip = false }) => {
   const [t] = useTranslation("repos");
   const [showModal, setShowModal] = useState(false);
 
-  return (
+  const tooltip = t("diff.fullscreen.open");
+  const content = (
     <>
-      <Button title={t("diff.fullscreen.open")} className="button" onClick={() => setShowModal(true)}>
+      <Button title={useTitleTooltip ? tooltip : undefined} className="button" onClick={() => setShowModal(true)}>
         <i className="fas fa-search-plus" />
       </Button>
       {showModal && (
@@ -58,6 +61,15 @@ const OpenInFullscreenButton: FC<Props> = ({ modalTitle, modalBody }) => {
       )}
     </>
   );
+
+  if (useTitleTooltip) {
+    return <>{content}</>;
+  }
+  return (
+    <Tooltip message={tooltip} location="top">
+      {content}
+    </Tooltip>
+  );
 };
 
 export default OpenInFullscreenButton;
diff --git a/scm-ui/ui-webapp/src/repos/sources/containers/Content.tsx b/scm-ui/ui-webapp/src/repos/sources/containers/Content.tsx
index 7f827f855a..2f3ccfb3c0 100644
--- a/scm-ui/ui-webapp/src/repos/sources/containers/Content.tsx
+++ b/scm-ui/ui-webapp/src/repos/sources/containers/Content.tsx
@@ -138,6 +138,7 @@ class Content extends React.Component<Props, State> {
             <OpenInFullscreenButton
               modalTitle={file?.name}
               modalBody={<BorderLessDiv className="panel">{content}</BorderLessDiv>}
+              useTitleTooltip={true}
             />
             <ExtensionPoint
               name="repos.sources.content.actionbar"