How to display fields of an entity reference field? My content type have an "entity reference field" related to another content type.

The only option I have is to display a link to the entity.



How can I display other fields from this entity?
You can choose rendered entity instead of label.  



After that click the options button (cog wheel) and choose the view mode of the rendered entity.



You can go the referenced content type's manage display and modify the chosen view mode to display the fields that you want



NOTE 
you can enable more display modes from manage display &gt; Default &gt; custom display settings  



and can also create your own view mode by pressing manage view modes on the bottom of the same screen