Within the Customizer navigate to Blog > General.
This setting give you four options for set the excerpt on posts index and archive:
- Yes: shows only the excerpt with a link to the article;
- No: shows the entire content on posts index, or the content until the more tag;
- Only title: shows only the title with no content at all
Here you can set the number of words to show in the excerpt when Show excerpt is set to yes.
If you need more blog settings get Brand Premium plugin