Showing full post

Hi,
How do I change the way the post displays in archive page?
I want the sticky top post to show full view, regular display, beneath the featured image, not shortened to the excerpt. Only the one post in each sub-site.
How do I do that?
Thank you for your assistance.

Note: I have downgraded to WordPress 4.1.2 because of the current bug in Multisite, not allowing to make new site. When it’s fixed – will upgrade.
Vera