Thanks for your interest in Syncfusion control.
We suggest you to set orthogonal Connector’s “Flip” to “false” in order to avoid the connector path being flipped. We also glad to inform you that we have modified your sample to achieve your requirement. Please refer the below code snippet and sample for your reference.
Here is the code snippet:
//Set boolean flip as "false"; true if path should be flipped; otherwise, false.
OrthogonalConnector con1 = new OrthogonalConnector(rect1.PinPoint, rect2.PinPoint, false);
con1.LineStyle.LineColor = Color.Black;
con1.LineStyle.LineWidth = 1f;
con1.HeadDecorator.DecoratorShape = DecoratorShape.Filled45Arrow;
Here is the sample:
Please try the above and let us know if any concern.