Hiding all pages but coverpage from google search

Hi everyone,

I am currently building my website and I have trouble hiding the folders of the navigation bar from google search (see screenshot). I managed to hide single pages via the SEO options but there's no option to hide the "title"/"main catagories" from the nav bar.
Is there an easy way to hide all pages but the coverpage from google search until I'm ready to launch the website?

Hope you can help me with this issue!