Changing homepage to not show summary

The quick summary is called a Teaser

1. click Administer > Structure > Content types.
2. click the "Manage display" link for the content type you wish to edit
3. click "Custom Display Settings" to drop down its settings
4. make sure "Teaser" is enabled. Save the content type if you had to make a change.you should see a "Teaser" sub-tab. Click it.
5. make sure the Format is set to "Summary or trimmed".
6. click the gear widget on the right side of the settingsset the trim length and click "Update"
7. click the "Save" button

https://drupal.org/node/514318