This article explains how to hide and remove shortcuts on Chrome's new tab page, and how to add custom shortcuts.
How to Remove New Tab Shortcuts in Google Chrome
When you open a new tab in Chrome, you’ll see shortcuts to websites you visit often below the search bar. If you don’t want these to show up, it’s best to hide them. Here’s how to do that.
Open a new tab in Chrome.
Click Customize Chrome at the bottom right.