When you select a branch connection in the Object list of a branch, the following properties are shown in the Properties dialog.
Name: This shows the name given to the branch connection, which by default is the name of the end branch.
Line Color: This defines the color of the branch connection. Click the small rectangle to choose a new color.
Line Width: Edit this field to increase or decrease the width of the branch connection.
Active Color: This defines the color of the branch connection when hovered.
Dash Style: This field lets you choose between various line styles.
Include in Export: This box is checked by default. Uncheck it if you intend to export your map to another format (HTML, Word and so on) but do not want the branch connection to be exported.