Hi Somboon,
There’s an updated Academy class based on 9.10.1 which uses the updated GA workflow architecture released at 9.10.
https://academy.mendix.com/link/paths/112/Build-a-Powerful-Workflow
You can also follow the how to here that shows how to build an employee onboarding process using the production release of workflow in Studio Pro
https://docs.mendix.com/howto/logic-business-rules/workflow-how-to-configure/
There’s additional documentation here on using Workflows in Studio
https://docs.mendix.com/studio/workflows/