Hi there!

Thanks for your query.

You may use the following code in your custom CSS:

.article-list .intro-articles-top-title {
    display: none;
}

I hope it wil serve your perpose:)

Note: Path towards custom CSS(Joomla 3): Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

Best Regards