Highlighting Text in Search Results

I was wondering if there was some way to highlight text in bold when you're searching for words. For example. Currently, my new website shows the extract but the first few words as well as Table of Content from Elementor (which I don't know how to remove it).

I was watching this video but my theme (Bard) does not have neither search.php nor content.php, so I have no idea where the code is located. I even don't know if I should create it from scratch to make it work.

I'm not too knowledgeable in PHP, so I don't know where to start.

Best regards.