Not on arXiv (unless I'm much mistaken), which is a preprint server, not a conventional journal.
arXiv accepts various flavors of TeX, or PDFs not produced by TeX [0], and automatically produces PDFs and HTML where possible (e.g. if TeX is submitted). In the case of the example paper under discussion, the authors submitted TeX with PDF figures [1], and the PDF version of the paper was produced by arXiv. The formatting was mainly set by using REVTeX, which is a set of macros for LaTeX intended for American Physical Society journals.
Looks nice but seems strange to switch from two columns to one column after the first page? Although maybe they’re just trying to demonstrate its capabilities.
arXiv accepts various flavors of TeX, or PDFs not produced by TeX [0], and automatically produces PDFs and HTML where possible (e.g. if TeX is submitted). In the case of the example paper under discussion, the authors submitted TeX with PDF figures [1], and the PDF version of the paper was produced by arXiv. The formatting was mainly set by using REVTeX, which is a set of macros for LaTeX intended for American Physical Society journals.
[0] https://info.arxiv.org/help/submit/index.html#formats-for-te... [1] https://arxiv.org/format/2312.12451