Feature summary (what you would like to be able to do and where):
Depending on how wide the screen is, adding a Wikidata Infobox to a category page on Wikimedia Commons makes the page only show one column of subcategories instead of two. The space below the Wikidata Infobox is not used for subcategory columns so it reduces the number of displayed columns by one.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
See the screenshot below for how Category:Videos of science looks like with an without WD infobox on my side:

Benefits (why should this be implemented?):
Hiding a column and not using the space does not make sense. Having more subcategories displayed makes it easier to glance over them, to find a relevant subcategory, makes it more overseeable, and so on and also prevents the files contained in the category to be buried far down. The screenshot should be fairly self-explanatory.

Additional info:
I previously proposed enabling collapsing essentially empty WD infoboxes as a workaround until a better solution is developed since that would make the column show up again and could easily be displayed with the click of a button. However, it seems like this has been / would be rejected and using the space below the infobox (with some CSS) would most likely be better anyway. A later alternative could be to move the WD infobox to the bottom of the left panel and out of the category page altogether.