Just to confirm we are talking about the same thing:
Screen Shot 2022-05-31 at 11.16.16 AM.png
Unsure in what context of your webpage the Justified content is not working but it could just be because of the way the Gridder works.
The elements get contained within their boundaries.
Screen Shot 2022-05-31 at 11.20.17 AM.png
Best Richard