diff --git a/sao/src/theme/coog/sao.less b/sao/src/theme/coog/sao.less
index 53b08c11ea4..8b9d2663f9c 100644
--- a/sao/src/theme/coog/sao.less
+++ b/sao/src/theme/coog/sao.less
@@ -670,6 +670,28 @@ div.form-boolean > input[type=checkbox].input-checkbox.form-control[readonly] {
         }
     }
 }
+
+// Use all space for XXX2Many which are the sole item in a notebook page
+.tab-pane.active > div.form-container:has(> div.form-one2many:only-child) {
+    > div.form-item.form-one2many {
+        padding-top:               0px;
+        > div.form-one2many.panel {
+            margin-left:           0px;
+            margin-right:          0px;
+        }
+    }
+}
+.tab-pane.active > div.form-container:has(> div.form-many2many:only-child) {
+    > div.form-item.form-many2many {
+        padding-top:               0px;
+        > div.form-many2many.panel {
+            margin-left:           0px;
+            margin-right:          0px;
+        }
+    }
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 // Rule engine
 ///////////////////////////////////////////////////////////////////////////////