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Every dashboard starts with a default theme that controls the background and the color scheme of visualizations. Changing the theme updates the appearance of the entire dashboard, including all charts and components.
You can quickly change the dashboard theme from the Dashboard Tab.
Click on the dashboard tab, click Theme and choose one of the themes.

Alternatively, click on the dashboard canvas and open Dashboard Settings
Open Dashboard Settings
Click an empty area of the canvas to change the dashboard properties in the Inspector Panel.

Choose a Theme
In the Document Appearance section, select a theme from the dropdown of the Theme property.
