The key point to make a section visible is to make at least one section's field visible.
Here are a few steps how to achieve this.
- Go to the Template Manager and choose the Standard Template for editing.
- Within the Template Editor choose any field in a section.
- Locate the "Field Security" in the Data section, not the Security section and ensure that the Everyone role doesn't have denied read permission and enable any other role (e.g. Editors) to read it.
- You can do the same for other fields inside the section.
- Save changes.
If you want to allow a user to edit the fields inside the section – just, using the described above technique, set Write permission for those fields to this user.