Could you tell me how to get the grouping? The center bold words, meaning, Number of Arrays, sets etc:
mwe:
\documentclass{report}
\usepackage[colorlinks]{hyperref}
\usepackage[symbols,nogroupskip,sort=none]{glossaries-extra}
\glsxtrnewsymbol[description={position}]{x}{\ensuremath{x}}
\glsxtrnewsymbol[description={velocity}]{v}{\ensuremath{v}}
\glsxtrnewsymbol[description={acceleration}]{a}{\ensuremath{a}}
\glsxtrnewsymbol[description={time}]{t}{\ensuremath{t}}
\glsxtrnewsymbol[description={force}]{F}{\ensuremath{F}}
\begin{document}
\tableofcontents
\printunsrtglossary[type=symbols,style=long]
\chapter{Sample}
Reference symbols: $\gls{x}$, $\gls{v}$, $\gls{a}$, $\gls{t}$,
$\gls{F}$.
\end{document}


\usepackage[symbols,nogroupskip,sort=none]{glossaries-extra}– NaveganTeX Nov 14 '20 at 10:34style=alttreegroupto the options of theglossaries-extrapackage. If you use this style (or the exact same example code as in my answer), you should get the grouping. – leandriis Nov 14 '20 at 11:28group={first}...! – NaveganTeX Nov 15 '20 at 10:28