How to remove Customizer’s Section and move Control straight to Panel using Child Theme

Assuming that the parent theme is running the above code at customize_register priority 10, you just have to add another customize_register action callback that runs afterward, like at 20. However, you cannot move a control to a panel. Controls can only reside inside of sections. To move a control to another section you can use:

add_action( 'customize_register', function ( WP_Customize_Manager $wp_customize ) {
    $wp_customize->remove_section( 'font_selection' );
    $wp_customize->add_section( 'some_other_section', array(
        'title' => __( 'Some other section', 'theme' ),
    ) );

    $body_font_family_control = $wp_customize->get_control( 'body_font_family' );
    if ( $body_font_family_control ) {
        $body_font_family_control->section = 'some_other_section';
    }
}, 20 );