This post is over a year old, some of this information may be out of date.

To remove the title area from a modern page, you have two options.

Option 1

Change the page layout to from Article to Home by editing it SharePoint Designer.

ModernLayOut.png

Option 2

Copy the default home page and use it for the new page you want to create.

Side Note

If you are interested in single webpart part, you can read this doc.