Here is the doc from ps with man.

> man ps

If ps cannot determine display width, as when output is redirected (piped) into a file or another command, the output width is undefined (it may be 80, unlimited, determined by the TERM variable, and so on).  The COLUMNS environment variable or --cols option may be used to exactly determine the width in this case.  The w or -w option may be also be used to adjust width.

-w     Wide output.  Use this option twice for unlimited width.


So for my part, in my terminal, the COLUMNS envvar is different in function of the size of my window, from 86 to 131 etc...

so, I think we can definitively close this issue.

Thank you,