How to customize Dashboard of admin screen.
Manage meta boxes
You can be able to hidden/remove/rename the title of meta boxes.
This can customize possible to hide or remove or change the meta box title, meta boxes recognition is necessary reload dashboard screen because all meta boxes is dynamically items.
Note: If you get problem with meta boxes customize, it most cause of problem is delete the meta box. Some themes is not have consider delete the meta box, so please change the hide from remove meta box.
Welcome to WordPress!
Hide the "Welcome to WordPress" panel.
Re-arrange meta boxes
Restrict the move of the meta boxes.