How can I add to some bends?
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Click the "Pointer Tool" on the toolbar and highlight the connector line.
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Press Shift and drag the mid-point handle of the connector line up or down.
This will add corners at 90 degree angles to the line with control
handles that can be used to manipulate the line further.
Tips & Warnings
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To add corners at angles less than 90 degrees, press control while moving the midpoint of the connector line up
or down.
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To convert a straight line connector to a curved line, right-click on the connector and select "Curved Connector."
Source How to Add Corners to Visio Connectors
