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To modify the appearance of widgets in Azure Databricks and adjust the size of a dropdown, follow these steps:

1. Open the notebook where the widget is located.
2. Click on the widget to select it.
3. In the top menu bar, click on "Widgets".
4. In the dropdown menu, select "Edit".
5. In the widget properties window, you can adjust the size of the dropdown by changing the "Height" value.
6. Click "Apply" to save the changes.
7. You can also customize the appearance of the dropdown by adding CSS styling to the widget using the displayHTML method.

Note: Widget customization in Azure Databricks requires knowledge of HTML, CSS, and JavaScript. If you are not familiar with these technologies, it is recommended to consult with a web developer to assist you with customizing the widgets.