Hi,
First of all welcome to the site!
Second, you should urgently black out your mother's telephone number in your screenshot and re-attach it. I am sure that you don't want this information broadcast to the world.
With regards to your actual question, I am sorry to say that I cannot help you. My phone displays contacts in a drastically different way (despite also being a Samsung phone). In fact whatsapp data is listed separately and the chat option is presented first for me. But hopefully someone with the same phone can be more helpful.
Regards,
Eric.