A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
It is by default that SharePoint would create a new page in the site pages library when we create a new News. The News is a content type in the page library, create a new news equals create a new page.
As a workaround, maybe you could use Announcements list to store your news. Then add the list web part in the main page. You could refer to this article :