This can be reproduced for example by using Custom Reports plugin and then putting an evolution graph report on a page and on the same page a table report.

The table report has a max width of 1200px configured.

You can also see this on the demo: Eg https://demo.matomo.cloud/index.php?module=CoreHome&action=index&idSite=1&period=day&date=yesterday#?idSite=1&period=day&date=yesterday&segment=&category=General_Actions&subcategory=General_Pages has a max width of 1200px vs other reports have a full width https://demo.matomo.cloud/index.php?module=CoreHome&action=index&idSite=1&period=day&date=yesterday#?idSite=1&period=day&date=yesterday&segment=&category=General_Visitors&subcategory=General_Overview

I assume we added a max width of 1200px to the table width because some reports might have only one column and then it be hard to see the label and the metric somewhat next to each other.

Sometimes it can be beneficial though to have the full width available and more consistency overall. Eg when the labels are long or when there are many metrics in a report.

Might be good to think about if we can make this more consistent