How To Set Harness :
=> Open Any Existing Flow And Unchecked Skip Create Harness From Process Tab Save The Flow.
=>Activate Rules Inspector ,After Run The Flow
Display The OutPut Screen In YourScreen
=>Click On Top "H " New Harness and Click On Save as Provides A class Group Name, Click On Save as
=>Select "Show WireFrame "Delete The Container(Top Container)
=>Create Your Own Section And Drag and Drop Section On To a Harness
=>Save The Harness, Go To Process Tab Of a Flow and Provide The Harness and Save the Flow
And Run The Flow To Check The Output.