This fast article will show you how to enable the excerpt box of WordPress post editor.
In order to display the excerpt in the post editor of WordPress, just mark the ‘excerpt’ check box in the ‘Screen Option’. The post editor will reloaded with the excerpt box inside.
Stages:
- Go to the post editor.
- Open the ‘Screen Option’ (upper the page).
- Mark the check box excerpt.
That’s it 
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