Changing image size of categories on front page

Hi, either I’m misunderstanding the proposed solution or it doesn’t apply to my problem. I’m trying to adjust the image size of the thumbnails on the front page of my HivePress installation, i.e. the size of the images displayed in the Listings category block.

In the media settings, I can change the e.g. Thumbnail Size, Medium Size, Large Size, etc., but it doesn’t say which images these settings apply to.

In any case, I don’t think any of those settings apply to the specific images I’m trying to adjust anyways, as the images I’m trying to adjust the size for are currently displayed in portrait mode, which does not seem to be the case for any of the settings available under SettingsMedia.