Converting a Rule Flow to a Main Flow 
You can convert a rule flow to a main flow when you want the execution of the Flow Ruleset to start with the Main Flow.
Locate the flow ruleset (Where is my flow ruleset?).
Expand the flow ruleset node, the Rule Flows folder and in the context menu of a rule flow node choose Set as Main Flow.
In the dialog box that appears, choose Yes.
Note
You can have only one main flow in a flow ruleset.