Common Truss on top like scissorrs

Hi, how can I adjust the truss like scissors on top? I think i did right on the dialogue details. please see attached pictures. Thanks

By the look of the image you have broken into the roof truss group and extended the top chord. My tip is to ensure you right-click the rafter Component and make it unique beforehand. This way, the opposing rafter doesn’t extend.
An easier way to do this would be to use the Skillion trusses add reduce the overhang that way the trusses stay parametric.