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Dear respected TBDoc,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, yes, the default Connector is a line for a process flow in Visio. And I guess the default behavior change by Microsoft product Visio development Team.
However, based on my test you can change default connector style by editing "Dynamic Connector" master in the document stencil.
via click-on-click Developer tab (If you can find Developer tab, please click File>Options>Customize Ribbon>select Developer>OK.)>tick Document Stencil. After that, you should see the Dynamic Connector>Right-click Dynamic Connector>Edit Master>Edit Master Shape>click Line>Arrows to select the arrow style you want>close the editing window (NOT the application - use the smaller X at the upper right). You should be prompted with a message like "Update 'Dynamic Connector' and all of its instances?" Click Yes.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad