In Unity, you can add a scrollbar to a Text Mesh Pro input field by using a Scroll Rect component. Here are the general steps to do it:

1. Create a new UI element, such as an Image, to serve as the container for your input field.
2. Add a Scroll Rect component to the container.
3. Assign the Text Mesh Pro input field to the Content property of the Scroll Rect component.
4. Add a vertical Scrollbar component to the container.
5. Assign the Scrollbar component to the Vertical Scrollbar property of the Scroll Rect component.

Note: The Scroll Rect component handles the scrolling, while the Scrollbar component displays the scrollbar itself. Make sure to adjust the Scroll Rect and Scrollbar properties, such as the size and position, to fit your needs.
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