If you need to delete or hide a dash tile follow these steps:
Click options in the left side bar
In the subcategories select Dash
Find the Dash tile you'd like to delete
Hover over the top bar to reveal the ( – ) delete button
Select Remove Layout to remove the tile from your dashboard layout
Then to save your changes, scroll to the top right of the page and press Update.
This will hide the tile but any content linked from it will still exist in Oplift should you need it later.