There are no need to use any plugin to disable health dashboard widget from your wordpress website dashboard.
There are two way to disable health width:
1.Using screen option.
Click on “screen option” button (top right) and unchecked the “Site health status” check box, your widget will be disable from admin dashboard
2.Using wordpress hooks
Add given below code into your theme function.php file
add_action('wp_dashboard_setup', 'remove_site_health_dashboard_widget');
function remove_site_health_dashboard_widget()
{
remove_meta_box('dashboard_site_health', 'dashboard', 'normal');
}
[youtube https://www.youtube.com/watch?v=Vk9_S3tOgRk]
That’s it 
