Since your publications are published online and publicly available, they are picked up by search engines. This means that your viewers can also search for your publications through search engines like Google or Bing.
You can turn off this feature by editing your navigation interface via the pencil icon. Under the general tab you will find an option called search engine index. When turned on, search engines will pick up your publications. Turn this feature off to disable this functionality.
Secure projects or domains to hide them from search engines
It is also possible to hide your projects from search engines by securing them.