Instance Public IP linked to the wrong website

Hi guys, I’m using Google VM instance to host EE. I’m hosting 9 websites until now. But when I try to open the instance public ip. it redirects me to one of the websites. It’s just a random website in the middle of the list, it’s not the first one I’ve been creating or the last one. How I can choose the main site that must open when someone enters the instance public IP address?

Guys! can anyone help?