Please add that code in Appearance->Customize->Additional CSS
#jp-relatedposts{
display: none !important;
}
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That’s not a default feature of the WP core.
So, either that’s a feature of your active theme, or you are using plugin for it.
If you are not sure, to find out try disabling all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.
___
If you can install plugins, install and activate “Health Check”:
It will add some additional features under the menu item under Tools > Site Health.
On its troubleshooting tab, you can Enable Troubleshooting Mode. This will disable all plugins, switch to a standard WordPress theme (if available), allow you to turn your plugins on and off and switch between themes, without affecting normal visitors to your site. This allows you to test for various compatibility issues.
There’s a more detailed description about how to use the Health Check plugin and its Troubleshooting Mode at
Thanks so much! The additional css did the trick!