Milan Dinić

This plugin automatically disables WordPress Events and News widget from the dashboard. By removing, you also prevent all external requests widgets makes so that it can work.
It is a very lightweight, it has no settings, just activate it and it works immediately.
And it’s on <a href="https://github.com/dimadin/disable-wordpress-events-and-news-dashboard-widget" rel="nofollow ugc">GitHub</a>.

Disable WordPress Events and News Dashboard Widget

Disable WordPress Events and News widget from the dashboard.

fullworks

If you manage multiple WordPress sites, you may find you get lots of calls about site health as this has been put right in front of your site owners eyes. 
This is a good thing if it is your own site but no so good if you are getting calls from non technical clients.
So this plugin removes it. Simple and as lightweight as any code snippet can be.
Additionally if you want to hide the Site Health from the tools menu, you can set
RSHFD_REMOVE_SITE_HEALTH_FROM_TOOLS in wp-config.php to true
<pre><code> define('RSHFD_REMOVE_SITE_HEALTH_FROM_TOOLS', true);
</code></pre>

Remove Site Health From Dashboard

Removes the Site Health from the Dashboard introduced in WP 5.4

Disable WordPress Events and News Dashboard Widget vs Remove Site Health From Dashboard