# Remove the square brackets in ieee-alphabetic style for the bibliography with biblatex

I have the square brackets in the JOURNALS, on the left. I just want to get rid of the square brackets, but keep what is inside [here, Aut01, Aut02 and so on] for the bibliography only.

\documentclass{article}

\usepackage{fontspec}
\setmainfont{TeX Gyre Termes}
\usepackage{polyglossia}
\setmainlanguage{spanish}
\setotherlanguage{german}

%\usepackage[german]{babel}
\usepackage{csquotes}
\usepackage[backend=biber,   citetracker=true, citestyle=alphabetic, bibstyle=ieee-alphabetic, sorting=ynt,sortcites=true]{biblatex}

\usepackage{filecontents} \begin{filecontents}{testcite.bib}
@book{a01,
author = {Author, A.},
year = {2001},
title = {Alpha},
}
@book{a02,
author = {Author, A.},
year = {2002},
title = {Bravo},
}
@article{c01,
author = {Cuthor, C.},
year = {2003},
title = {Charlie},
}
@article{c02,
author = {Cuthor, C.},
year = {2004},
title = {Charlie},
}

@article{c03,
author = {Cuthor, C.},
year = {1978},
title = {Charlie},
}
@article{c04,
author = {Cuthor, C.},
year = {1981},
title = {Charlie},
}

@article{ac01,
author = {Cuthor, C. and Author, A.},
year = {1987},
title = {Charlie},
}
@article{ac02,
author = {Cuthor, C. and Author, A.},
year = {1973},
title = {Charlie},
}

@article{ac03,
author = {Cuthor, C. and Author, A.},
year = {1981},
title = {Charlie},
}
\end{filecontents}

\begin{document}
Refs. \cite{a01, a02, ac01, ac02, c01, c02, c03, c04, ac03}

\today

%\clearpage

\newrefcontext[sorting=nyt]
\selectlanguage{german}
\endrefcontext
\end{document}


The format of the citation labels in the bibliography is controlled by the labelalphawidth and shorthandwidth formats (for numeric labels there is also labelnumberwidth).
\DeclareFieldFormat{labelalphawidth}{#1}

In the citations the brackets are either hard-coded (as is often the case in the textcite macros) or given by the wrapper command supplied to \DeclareCiteCommand. Changing those brackets can require more code even though it is not actually more difficult.