Your agency name, logo, favicon, and theme color are available on every plan, including Free, and appear across the entire client-facing experience. They’re set on the Agency tab of Agency Settings (alongside the Domain, Email Settings, and Custom Menus tabs).
On the Agency tab, Agency Theme Color sets the primary color used throughout your dashboard and every client portal. Pick a Preset swatch or use Choose Own for a custom color; a live preview shows how primary and outline buttons will look.