Radio button in drafting not highlighted

[andykhoo81]

Hi, I am a new user to catia . When I started drafting, and right click into properties, I could not change the settings of the approximate edges because it is not highlighted. Could someone guide me on how to turn this function on?

many thanks

 

[andykhoo81]

Actually, I could only click hidden line and 3D specs in the Dress-up section. How do i click to show threads? I am using V15