With WP Dark Mode you can use a unique floating switch icon to toggle between light mode and dark mode.
To use this feature, navigate to WP Dark Mode > Customization > Switch Settings. Go all the way to the bottom of this page and find the Custom Switch Icon section.
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Now upload your preferred switch icons for light mode and dark mode. Once you are satisfied with it, click on Save Changes.
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The new icon will be added to your floating switch.
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