How do I stop WordPress parent theme from overriding child widget?

I’m using a child theme of the Ocean WP theme. I registered four widgets in the child theme’s functions.php file. Everything worked fine until the most recent parent theme update, which is replacing the second widget with “left sidebar.”

I found the offending section of the parent theme’s functions.php and commented out:

register_sidebar( array(
  'name' => esc_html__( 'Left Sidebar', 'oceanwp' ),
  'id' => 'sidebar-2',
  'description' => esc_html__( 'Widgets in this area are used in the left sidebar region.', 'oceanwp' ),
  'before_widget' => '<div class="sidebar-box %2$s clr">',
  'after_widget' => '</div>',
  'before_title' => '<h4 class="widget-title">',
  'after_title' => '</h4>',
) );

Obviously, this doesn’t follow best practices. I assume I need to de-register the left sidebar in my child theme’s functions.php file but am not very familiar with php yet. What do I need to do to prevent the left sidebar from overriding my widget, in a way that conforms to best practices?

Thanks!