@BA_HH
Except for static connectors, to put the connector at a connection point, you may check whether PaulHerber-6778‘s answers is helpful.
In my opinion, we could not force Visio to use a static connector. It all depends on how you create a connection, such as dragging from one connection point to the other after selecting the connector tool, or from one shape to another.
More information, please refer to the part of Use a static or a dynamic connection in article "All you need to know about Visio desktop connectors".
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