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 > Default > custom display settings
and can also create your own view mode
by pressing manage view modes
on the bottom of the same screen