If you regularly update your browser (and you should), you may have noticed that none of the sites show www anymore, if there was one. Google has already announced that it will stop showing www as default.
It all started with google webmaster tools or search console as it is now called, where he introduced property and where the main domain is without www or with www and that it doesn't matter, but the domain itself is important. Therefore, it is accompanied by this new update where it simply does not show, it does not mean that it is not there, it just does not show.
Of course, if a domain has subdomains, they will be displayed as before, this only applies to www.
