How to hide "Include file in display" in File Field?
You need to set that in the field's settings page. 

Structure &gt; Content Types &gt; [your content type] &gt; Manage Fields &gt; Edit [your file field] 


You will see settings for the Enable Display Field Option. The caveat is that if you already have data in this file field, unchecking this may not have an effect. 

(See my screen capture)