diff --git a/client/scss/components/_editing-sessions.scss b/client/scss/components/_editing-sessions.scss
index c5efc7cf68..6a8b354f48 100644
--- a/client/scss/components/_editing-sessions.scss
+++ b/client/scss/components/_editing-sessions.scss
@@ -1,5 +1,9 @@
 .w-editing-sessions {
-  @apply w-flex w-p-0 w-m-0 w-pr-8 w-mr-5 w-border-r w-border-border-furniture;
+  @apply w-mr-auto sm:w-pr-8 sm:w-mr-5 sm:w-border-r w-border-border-furniture;
+}
+
+.w-editing-sessions__list {
+  @apply w-flex w-p-0 w-m-0;
 }
 
 .w-editing-sessions__avatar {
diff --git a/client/scss/components/_ping.scss b/client/scss/components/_ping.scss
index aa99f03373..989df1a020 100644
--- a/client/scss/components/_ping.scss
+++ b/client/scss/components/_ping.scss
@@ -42,7 +42,7 @@
   }
 
   25% {
-    box-shadow: 0 0 0 10px
+    box-shadow: 0 0 0 8px
       hsla(
         var(--w-color-critical-100-hue),
         var(--w-color-critical-100-saturation),
diff --git a/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/list.html b/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/list.html
index cd01bcab4d..dd3bf2aead 100644
--- a/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/list.html
+++ b/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/list.html
@@ -1,6 +1,6 @@
 {% load wagtailadmin_tags i18n %}
 
-<ol class="w-editing-sessions">
+<ol class="w-editing-sessions__list">
     {% for session in sessions|slice:":4" %}
         <li>
             {% fragment as avatar %}
diff --git a/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/module.html b/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/module.html
index e552aac15c..290c8e31bc 100644
--- a/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/module.html
+++ b/wagtail/admin/templates/wagtailadmin/shared/editing_sessions/module.html
@@ -24,6 +24,7 @@
 
 <form
     method="post"
+    class="w-editing-sessions"
     data-controller="w-swap w-action w-session"
     data-w-swap-target-value="#w-editing-sessions"
     data-w-swap-src-value="{{ ping_url }}"
diff --git a/wagtail/admin/templates/wagtailadmin/shared/headers/slim_header.html b/wagtail/admin/templates/wagtailadmin/shared/headers/slim_header.html
index b1d0a7d27d..430c4bb8f5 100644
--- a/wagtail/admin/templates/wagtailadmin/shared/headers/slim_header.html
+++ b/wagtail/admin/templates/wagtailadmin/shared/headers/slim_header.html
@@ -114,13 +114,13 @@
                 {% endif %}
             {% endblock %}
 
-            {% block editing_sessions %}
-                {% if editing_sessions %}
-                    {% component editing_sessions %}
-                {% endif %}
-            {% endblock %}
+            <div class="w-w-full w-overflow-auto sm:w-w-min w-flex sm:w-flex-nowrap sm:w-flex-row w-items-center w-p-0 sm:w-py-0 w-px-2 sm:w-pr-4 sm:w-justify-end">
+                {% block editing_sessions %}
+                    {% if editing_sessions %}
+                        {% component editing_sessions %}
+                    {% endif %}
+                {% endblock %}
 
-            <div class="w-w-full sm:w-w-min w-flex sm:w-flex-nowrap sm:w-flex-row w-items-center w-p-0 sm:w-py-0 sm:w-pr-4 sm:w-justify-end">
                 {% block toggles %}
                     {% if side_panels %}
                         {% include "wagtailadmin/shared/side_panel_toggles.html" %}
diff --git a/wagtail/admin/tests/test_editing_sessions.py b/wagtail/admin/tests/test_editing_sessions.py
index 8412c41578..31a9b5a9d0 100644
--- a/wagtail/admin/tests/test_editing_sessions.py
+++ b/wagtail/admin/tests/test_editing_sessions.py
@@ -154,7 +154,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 1)
         session_text = rendered_sessions[0].text
         self.assertIn("Vic Otheruser", session_text)
@@ -192,7 +192,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 1)
         session_text = rendered_sessions[0].text
         self.assertIn("Vic Otheruser", session_text)
@@ -230,7 +230,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 1)
         session_text = rendered_sessions[0].text
         self.assertIn("Vic Otheruser", session_text)
@@ -270,7 +270,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 1)
         session_text = rendered_sessions[0].text
         self.assertIn("Vic Otheruser saved a new version", session_text)
@@ -326,7 +326,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 1)
         session_text = rendered_sessions[0].text
         self.assertIn("Vic Otheruser saved a new version", session_text)
@@ -408,7 +408,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 2)
         session_text = rendered_sessions[0].text
         self.assertIn("Gordon Thirduser saved a new version", session_text)
@@ -478,7 +478,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 2)
         session_text = rendered_sessions[0].text
         self.assertIn("System saved a new version", session_text)
@@ -721,7 +721,7 @@ class TestPingView(WagtailTestUtils, TestCase):
         )
 
         soup = self.get_soup(response_json["html"])
-        rendered_sessions = soup.select("ol.w-editing-sessions li")
+        rendered_sessions = soup.select("ol.w-editing-sessions__list li")
         self.assertEqual(len(rendered_sessions), 2)
         session_text = rendered_sessions[0].text
         self.assertIn("You have unsaved changes in another session", session_text)