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Thank you very much, Stefan! Will do that.

By the way, user beware: going from TeXmaker v. 5 to v. 6 looks more like a 'downdate' than an update. I've noticed several problems. Among them, highlighted text is almost unreadable. Its colour is light grey, with a light blue background. Please see the ...

In the View menu, is the Source Viewer line checked? If so, uncheck it.

TeXmaker's configuration window shows dozens of shortcuts, but I can't find the Quick Build one. I'd like to change the default Fn-F1 shortcut to Cmd-T (for Typesetting).

In TeXmaker v. 5, I did that without any problem, but updating the app to v. 6 ruined my setting and the Quick Build line ...

I've found a way (I should have thought of it right away!).

In the preamble:
For each poem title, instead of the line "\poemtitle{Some title}", the following two lines:

That sounds silly, but I can't find a way to number poem titles, like "1. First poem", "2. Second poem", etc., instead of "First poem", "Second poem", etc. Thanks a lot for your help!

% XeLaTeX, manual
\documentclass[twoside,french,10pt]{scrbook}
\usepackage{fontspec}
\usepackage{polyglossia ...

Thank you very much Stefan!

I've just found the culprit, it's the line:

\usepackage[fontsize=13pt]{scrextend}

I don't know why this package works perfectly on the notebook but not on the iMac, but at least the problematic line is now identified.

Your help would still be much appreciated: is there a way to tell LaTeX that ...

Hello all,

I have a LaTeX document on my M1 MacBook Pro, and everything is fine. No issue at all. The Pdf is perfect.

But when I copied the .tex file on my Intel iMac, I got 35 configuration errors. The Pdf could be generated, but the chapters and sections titles were in a smaller and thinner ...

Ijon Tichy, thank you very much for your input. I'll follow your advice and use \hyphenation to solve special cases. I'm not sure it's a bug problem, maybe it's just too complicated to manage. For instance, "pa-rent" is legal if it means "relative" but it's illegal if it means "(they) avert ...

I've just found a solution: replacing \usepackage{ebgaramond} with \usepackage{libertinus} solves almost all cases of lengthened lines.
The last remaining ones were solved with the line \usepackage[protrusion=true,expansion=true,final,babel]{microtype}. Thanks a lot MJK !