Fix UI README doc (#13378)

Author: wu-sheng

docs/en/ui/README.md

@@ -108,7 +108,10 @@ About this link, there are several customizable options
 
 ## Settings
 
-Settings provide language, server time zone, and auto-fresh options. These settings are stored in the browser's local storage. Unless you clear them manually, those will not change.
+Settings provide language, server time zone, and auto-fresh options. 
+- The language preference setting is stored in the browser's local storage. Unless you clear them manually, those will not change.
+- The server timezone should be automatically loaded from server side, unless you need to set manually.
+- Refresh time is temporary setup, it will be reset the next time.
 
 ## FAQ