\documentclass{article}

\usepackage[a4paper,margin=1in]{geometry}
\usepackage[T1]{fontenc}
\usepackage[stylemods=mcols]{glossaries-extra}
\usepackage[notestencaps,ascii]{testidx-glossaries}

\tstidxmakegloss

\begin{document}
\tstidxprintglossary[style=mcolindexgroup]

\testidx
\end{document}
