diff --git a/addons/web/static/src/views/form/form_controller.scss b/addons/web/static/src/views/form/form_controller.scss
index db6c814733d..e0008ba23ae 100644
--- a/addons/web/static/src/views/form/form_controller.scss
+++ b/addons/web/static/src/views/form/form_controller.scss
@@ -1116,7 +1116,7 @@
 
         > .o_form_sheet {
             width: 100%;
-            max-width: map-get($container-max-widths, xl);
+            max-width: map-get($container-max-widths, xxl);
         }
     }
 }