diff --git a/addons/web/static/src/views/form/form_controller.scss b/addons/web/static/src/views/form/form_controller.scss
index 8c7f97cff18..69776fba0de 100644
--- a/addons/web/static/src/views/form/form_controller.scss
+++ b/addons/web/static/src/views/form/form_controller.scss
@@ -681,6 +681,7 @@ $o-form-label-margin-right: 0px;
 
         .o_form_sheet_bg {
             padding: 0;
+            width: 100%;
 
             > .o_form_statusbar, > .alert {
                 /**
@@ -781,7 +782,6 @@ $o-form-label-margin-right: 0px;
 }
 
 .o_form_view.o_xxl_form_view {
-    flex-flow: row nowrap;
 
     .o_form_sheet_bg {
         flex: 1 1 auto; // Side chatter is disabled if this has to shrink but this was added for safety