Hi Hermenegildo - welcome to the community!
Can you be more specific for what you want to see? Is this the values of the fields after you create an Issue? If so, in the "old JIRA issue view" custom fields that do not have a value (are empty) typically do not appear in the view. You would have to click on Edit to see those fields. If you set the default for any of the custom fields you should see the fields after the issue is created.
If you are using the "new JIRA issue view", then the fields should show up on the right hand side. If not, then edit the Project Settings and change the Issue Layout values.
I hope that helps!
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