This visual execution shows why custom WordPress themes offer full control. Starting from activating a custom theme, WordPress loads the theme files and runs the functions.php code. Adding theme support enables features like custom logos and post thumbnails. Users can upload logos and add featured images, which the theme displays as coded. Editing theme files changes the site layout and style exactly as desired. Variables like theme features, site logo, and post thumbnails change step-by-step, showing how control grows. Key moments clarify why pre-built themes limit changes and how adding support affects features. Quiz questions test understanding of each step and variable changes. Overall, custom themes give full control by letting you write and run your own code.