Comment by insin

I make an extension which lets you fix this to your liking (choose the minimum number of videos you want per row, while also fixing the spacing issues overriding the underlying --ytd-rich-grid-items-per-row CSS variable causes), plus many, many more annoyances and what I felt were missing options and features for YouTube, like being able to completely hide Shorts:

https://soitis.dev/control-panel-for-youtube

Edit: for comparison with the screenshot in TFA, this is my Home feed on a 14" MacBook. No Shorts, no Mixes, videos which are 85% (configurable) watched or more are hidden, stream VODs from channels which also stream, Movies and TV, and any channels "Don't recommend channel" refuses to work on, can all be hidden for you:

https://imgur.com/LUnpz9e