You can make use of different split button sizes, default and small.
The pop-up is a toggleable container that holds a list of action items or custom content that will open or close when the button is clicked. You can customize all the items in a pop-up.
You can use a horizontal line separator to represent similar action items as a group within the list of available items.
In Split Button, you have control over all the UI elements and its behaviors. This provides the best user experience to users through a rich set of developer-friendly APIs.