[DSC-2038] Added parameter in submission settings

Author: Simone-Ramundi

src/config/default-app-config.ts

@@ -293,7 +293,8 @@ export class DefaultAppConfig implements AppConfig {
     dropdownHintEnabled: {
       // NOTE: list of metadata fields for which the dropdown hint is enabled
       // eg. 'dc.access.rights': true,
-    }
+    },
+    minChars: 3,
   };
 
   // Default Language in which the UI will be rendered if the user's browser language is not an active language