As a result I installed the "Control Panel for Youtube" chrome plugin and Im able to fix it back to 6 videos per row. I also found I could make shorts play in the traditional youtube player by default - which is an added relief.
Some of the revelations from the various lawsuits against Google by the US and other governments over the years have been about this.
The company replaced leaders who cared about users with leaders who cared about revenue optimization and those leaders changed the direction of the company to what we all see in all of their products these days.