[Koha] Removing a field from a biblio in Koha 3

Greetings, In the cataloguing interface, when a field is repeatable you get a '+' sign next to the field, which you can happily click and repeat the field. This also reflects on the marc blob. But now I can't find a way to delete the field in the editor -- even if it has no data, it keeps showing up. What I did now was to fiddle with the marc blob for the biblionumber and delete the MARC references to the repeated, data-less field, but I don't think this is the right way. Is there anything in development regarding this issue? Thanks for your time, Jose