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Help understanding Groff environements ( .ev )

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Old 10-29-2018
Help understanding Groff environements ( .ev )
Hi guys!

I'm not exactly a newbie Unix-like user (Slackware and Red Had in the 90's, distro hoping in the 2000's, ArchLinux for the best part of the 2010's, and currently OpenBSD). But I certainly have a newbie question about Groff. Smilie

I had decided to learn groff, and never did. And then Luke Smith on YouTube unfortunately made a video about it, reminding me that decision.
I've been a good boy and RTFM for the last 48h or so. But something still eludes me.
I can't choose text alignment, I mean I can't get .ad , ... to work properly.
I think it has something to do with the environment (groff environment, not the shell). Because no matter what argument I give to .ad :
If I use 0 ( .ev 0 ) everything is always left aligned.
If I use anything else ( .ev {1, 2, foo ,duh!, ...} ) everything is justified.

The manual does not seem to explain what are the default envs, and how to set them. Or I missed it...
Can someone help?

GNU groff version 1.22.3 on OpenBSD 6.4 x86_64
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LEARN ABOUT XFREE86

mmroff

MMROFF(1)						      General Commands Manual							 MMROFF(1)

NAME

       mmroff - reference preprocessor

SYNOPSIS

       mmroff [ -x ] groff_arguments

DESCRIPTION

       mmroff is a simple preprocessor for groff, it is used for expanding references in mm, see groff_mm(7).  groff is executed twice, first with
       -z and -rRef=1 to collect all references and then to do the real processing when the reference file is up to date.

       -x     Just create the reference file. This can be used to refresh the reference file, it isn't always needed to have  accurate	references
	      and by using this option groff will only be run once.

AUTHOR

       Jorgen Hagg, Lund, Sweden <jh@axis.se>.

FILES

       /usr/share/groff/1.21/tmac/m.tmac

       /usr/share/groff/1.21/tmac/mm/*.cov

       /usr/share/groff/1.21/tmac/mm/*.MT

       /usr/share/groff/1.21/tmac/mm/locale

SEE ALSO

       groff_mm(7), groff_mmse(7), groff(1), troff(1), tbl(1), pic(1), eqn(1)

Groff Version 1.21						 31 December 2010							 MMROFF(1)