By default, WooCommerce Private Store uses the default page template in your theme when displaying the store login page (this is the page where users enter a password to unlock the store). The default page template is usually page.php.

At the present time, there's no option or filter available to set a custom page template, but it can be achieved by adding a hook to template_include and checking the slug (i.e. post_name of the current page).

Here's some example code which sets the template to page-store-login.php. For this code to work, the page-store-login.php file must exist in the current active theme (e.g. /wp-content/themes/my-theme/page-store-login.php).

// WooCommerce Private Store: set a custom template for the store login page.
add_filter( 'template_include', function( $template ) {
    global $post;

    if ( $post instanceof WP_Post && false !== strpos( $post->post_name, 'store-login' ) ) {
        // Change 'page-store-login.php' to the file name of your login page template, relative to your theme directory.
        $store_login_template = locate_template( 'page-store-login.php' );

        if ( $store_login_template ) {
            $template = $store_login_template;
        }
    }

    return $template;
} );

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