The generate_layout_element_display allows us to bypass the Display Rules, so we can enable or disable an Element under our own conditions.
For example, if we want to assign a specific layout to Author Tom only:
add_filter( 'generate_layout_element_display', function( $display, $element_id ) {
if ( 10 === $element_id && is_author( 'Tom' ) ) {
$display = true;
}
return $display;
}, 10, 2 );