Hi,
You can find the generalization and need to select the “Workflow” entity, as per the given below image.
Ref link: https://docs.mendix.com/refguide/entities
https://docs.mendix.com/refguide/workflows
https://medium.com/mendix/mendix-workflow-an-overview-a97aadf7cbc1
May I suggest you to consult our updated learning path about workflows https://academy.mendix.com/link/paths/112/Build-a-Powerful-Workflow. It is based on the version 9.10.1. Regarding the WorkflowContext, this is an entity which was used in the older releases and will not be used any more.