The primary colour setting allows you to define a colour scheme that reflects your brand identity across various UI elements, including web and email templates. This primary colour is applied to elements such as buttons, toggles, and action prompts, helping users recognize your brand consistently. Accessibility is a key consideration here; the primary colour should contrast well against the background to ensure readability without the need for additional background elements. We recommend testing the primary colour on both light and dark backgrounds to confirm it meets accessibility standards and enhances user experience.