diff --git a/packages/react-params/src/Param/Option.tsx b/packages/react-params/src/Param/Option.tsx
index e8c8f406ed..ba19168f05 100644
--- a/packages/react-params/src/Param/Option.tsx
+++ b/packages/react-params/src/Param/Option.tsx
@@ -16,7 +16,7 @@ import Param from './index';
 interface Props extends CProps, I18nProps {}
 
 function Option ({ className, defaultValue, isDisabled, name, onChange, onEnter, t, type: { sub } }: Props): React.ReactElement<Props> {
-  const [isActive, setIsActive] = useState(true);
+  const [isActive, setIsActive] = useState(false);
 
   useEffect((): void => {
     !isActive && onChange && onChange({
diff --git a/packages/react-params/src/Param/Struct.tsx b/packages/react-params/src/Param/Struct.tsx
index 812a330b82..3506af80e9 100644
--- a/packages/react-params/src/Param/Struct.tsx
+++ b/packages/react-params/src/Param/Struct.tsx
@@ -54,7 +54,7 @@ export default class StructParam extends React.PureComponent<Props, State> {
     const params = defs.map((type): { name?: string; type: TypeDef } => ({ name: type.name, type }));
 
     return (
-      <div>
+      <div className='ui--Params-Struct'>
         <Base
           className={className}
           label={label}