When you click on customizer from the appearance tab, it will redirect you to customizer page and the first tab below your active theme indicator is the general settings.
Inside General Settings option contains:
- Wide & Boxed & Frame Layout
- Main Wrap
- Content Wrap
- Page Content Margin Top
- Page Content Margin Bottom
- Row Top Padding
- Row Bottom Padding
- Responsive
- Search Text
- Form Style
- reCaptcha Sitekey
- reCaptcha Secret key