I successfully use glossaries-extra style alltree to automatically align my list of abbreviations and symbols depending on the widest element. Now, I'd like to increase the horizontal spacing by e.g. 2mm between DFT and discrete Fourier transform without breaking \glsfindwidesttoplevelname[abbreviations,symbols]. Is this possible or is a table style more suitable? Thanks!
MWE:
\documentclass[
a4paper,
10pt,
]{scrreprt}
\usepackage[no-math]{fontspec}
\usepackage[showframe]{geometry}
\usepackage{hyperref}
% Glossaries
\usepackage[abbreviations,symbols,nonumberlist,nogroupskip]{glossaries-extra}
\makeglossaries[abbreviations,symbols]
% No glossary title
\renewcommand{\glossarysection}[2][]{}
\setglossarypreamble[abbreviations]{\vspace*{-\baselineskip}}
\setglossarypreamble[symbols]{\vspace*{-\baselineskip}}
% Glossaries style
\setglossarystyle{alttree}
\setabbreviationstyle{long-short}
\renewcommand{\glsnamefont}[1]{\normalfont{#1}}
% Abbreviations
\newabbreviation{fem}{FEM}{finite element method}
\newabbreviation{dft}{DFT}{discrete Fourier transfom}
% Symbols
\glsxtrnewsymbol[description={Fourier series constant component multiplier}]{a0}{a\textsubscript{0}}
\glsaddallunused % Print all entries including uncited ones
\glsfindwidesttoplevelname[abbreviations,symbols] % Automatically find widest element
\begin{document}
\chapter{List of Abbreviations and Symbols}
\section{Abbreviations}
\printglossary[type=abbreviations]
\section{Symbols}
\printglossary[type=symbols]
\end{document}
