diff --git a/src/elements/content-sidebar/ActivitySidebar.js b/src/elements/content-sidebar/ActivitySidebar.js
index 7b1a1267d6..a5fd97be36 100644
--- a/src/elements/content-sidebar/ActivitySidebar.js
+++ b/src/elements/content-sidebar/ActivitySidebar.js
@@ -1412,7 +1412,7 @@ class ActivitySidebar extends React.PureComponent<Props, State> {
             return (
                 <div
                     aria-labelledby={label}
-                    className="bcs-content"
+                    className="bcs-content bcs-NewActivityFeedContent"
                     data-testid="bcs-content"
                     id={`${label}-content`}
                     role="tabpanel"
diff --git a/src/elements/content-sidebar/activity-feed-v2/ActivityFeedV2.scss b/src/elements/content-sidebar/activity-feed-v2/ActivityFeedV2.scss
index c2ceaec619..cef038ec33 100644
--- a/src/elements/content-sidebar/activity-feed-v2/ActivityFeedV2.scss
+++ b/src/elements/content-sidebar/activity-feed-v2/ActivityFeedV2.scss
@@ -63,3 +63,8 @@
         padding: var(--bp-space-030) var(--bp-space-040);
     }
 }
+
+// Lets inner ellipsis truncation resolve against the sidebar width.
+.bcs-NewActivityFeedContent {
+    min-width: 0;
+}