The Blog Settings section in the Event theme Customizer contains 2 options. Navigate to Appearance → Customize → Theme Options → Blog Settings to access these settings.

Options

• Excerpt Limit (Number) — Number of words for blog excerpts (10–200).
• Number of News Per Page (Number) — How many posts to display on the blog page (1–100).

After making changes, click Publish at the top of the Customizer to save your settings.