Hi,
Thank you for reaching out, and we're sorry for the inconvenience this has caused.
At the moment, SP Page Builder Pro does not include a dark mode or an option to change the UI color palette. We understand how important this feature can be, especially for users with visual sensitivities, and we regret that we cannot offer it at this time.
We appreciate you sharing your feedback, and we will forward your request to our development team for consideration in future updates. While we can't promise if or when this feature will be implemented, feedback like yours helps us prioritize future improvements.
Thank you for your understanding.