Select the connector line you wish to adjust styles for.
​
​

Locate the Style options in the toolbar or right-hand sidebar.
​
​

​

Use the Line Style controls to make the selected connector a solid, dashed, or dotted line.
​
​

​

Use the Thickness field to change the line thickness by either typing a number or clicking the up/down arrows.
​
​

​

Use the Start and End controls to independently change the connector line start and end point features to none, arrow, filled circle, or hollow circle.
​
​