it is not possible to change the number of column in the footer top menu

Proposal

No new prop.

Line 7 in https://git.drupalcode.org/project/ui_suite_dsfr/-/blob/1.1.x/components... :

<div class="fr-grid-row fr-grid-row--start fr-grid-row--gutters">
          {% for category in top %}
          <div class="fr-col-12 fr-col-sm-3 fr-col-md-2">

We may need a cols rule according to top|length:

• if 2 categories: 6/6
• if 3 categories: 4/4/4
• something like that

https://twig.symfony.com/doc/3.x/filters/length.html

However

This is not expected by the DSFR upstream documentation: https://storybook.systeme-de-design.gouv.fr/?path=/docs/footer--docs

The cols rules are always the same, independently from the number of categories.