Hello, currently the abstract of a blog post in my custom feed is just a mix of first few characters and doesn't make a coherent sentence. Therefore, I want to edit it. See image below. How do I remove the yellow portion from the custom feed?
If you require more clarification, please let me know. Thank you in advance!

Thank you so much @Einat Halperin!
Inside the post editor - post settings - edit the excerpt field.