diff --git a/o2web/source/x_component_process_FormDesigner/$Preview/default/css.wcss b/o2web/source/x_component_process_FormDesigner/$Preview/default/css.wcss
index c642f8eac233179a9bd9be0ef9a2cf9d4d75220c..9ca27a14fbe2c526b45b7aa834f8daec34d64c0e 100644
--- a/o2web/source/x_component_process_FormDesigner/$Preview/default/css.wcss
+++ b/o2web/source/x_component_process_FormDesigner/$Preview/default/css.wcss
@@ -14,7 +14,8 @@
 	"formJsonNode": {
         "width": "100%",
         "border": "1px solid #999",
-        "display": "none"
+        "display": "none",
+        "overflow": "auto"
     },
 	"actionButton": {
 	    "width": "80px",