The dashboard on the New Tab Page allows you to show or hide widgets on the page, choose whether or not to display Sponsored images and more. To begin customizing your New Tab Page, click the Customize icon on the bottom-right of the page:

Doing so will reveal the Customize Dashboard menu with settings corresponding to different items on the page:

Show Background Image 

Toggles the background images displayed on the New Tab Page on/off.

• Show Sponsored Images
  Sponsored images will appear on every fourth new tab opened. You can opt-out of seeing these sponsored images by toggling this option off.

Show Brave Stats

Shows/hides the Trackers & Ads Blocked count, Bandwidth Saved and theTime Saved

• Trackers & Ads Blocked: This tracks the amount of Trackers/Ads blocked by Shields since using your browser. 
• Bandwidth Saved: This is the estimated amount of data (bandwidth) Brave has saved you while browsing.
• Time Saved: This is the estimated amount of time (in Hours/Minutes) you have saved by using Brave.

Show Top Sites

Shows/Hides the list of top site shortcuts and allows you to choose between displaying Favorites (which are top sites curated by you) or Frequently Visited (sites that auto-populate based on websites you frequently visit). Please see How do I Customize Top Sites on my New Tab Page? for more information on Top Sites.

Brave News

Shows/Hides Brave News on the new tab page and allows you to customize the sources Brave News pulls from. Please see How do I use Brave News? for more information on Brave News.

Show Clock

Shows/hides the New Tab Page clock widget and allows you to swap between 24-hour clock and 12-hour clock format.

Cards

Show/Hide individual "cards" on the stack on the new tab page and/or allows you to disable cards all together. Please see How do I Customize and Use cards on the New Tab Page? for more information on the new tab page cards.