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wp_default_theme › WordPress Constants

Since3.0.0
› define( 'WP_DEFAULT_THEME', 'twentytwentyfive' );
Defined at:

Slug of the default theme for this installation.

Used as the default theme when installing new sites. It will be used as the fallback if the active theme doesn't exist.

Source 

define( 'WP_DEFAULT_THEME', 'twentytwentyfive' );