diff --git a/static/daybook.css b/static/daybook.css
index c23e84a..e5239fe 100644
--- a/static/daybook.css
+++ b/static/daybook.css
@@ -556,6 +556,21 @@ h1 {
   padding: 0;
 }
 
+/* When a single source is selected, the per-row source column is redundant
+   (every row has the same source), so drop it and give the space back to the
+   title. Shown only under "All sources". */
+.artifact-list.no-source-col .artifact-row {
+  grid-template-columns: 3.15rem minmax(0, 1fr);
+}
+
+.artifact-list.no-source-col .artifact-source {
+  display: none;
+}
+
+.artifact-list.no-source-col .artifact-row-main {
+  border-right: 0;
+}
+
 .artifact-row:hover {
   background: var(--row-hover);
   box-shadow: none;
diff --git a/templates/artifacts/feed.html b/templates/artifacts/feed.html
index 7b4287a..713a065 100644
--- a/templates/artifacts/feed.html
+++ b/templates/artifacts/feed.html
@@ -53,7 +53,7 @@
         <span>{{ artifacts|length }} artifact{{ artifacts|length|pluralize }}</span>
       </div>
 
-      <div class="artifact-list" data-artifact-list>
+      <div class="artifact-list{% if selected_source %} no-source-col{% endif %}" data-artifact-list>
         {% if day_groups %}
           {% include "artifacts/_day_groups.html" with has_more=older_count next_before=window_start|date:"Y-m-d" %}
         {% else %}