There's a ublock filter you can use to make them small again. I'll post the code once I get home.

! Changing the amount of videos per row
youtube.com##ytd-rich-grid-renderer:style(--ytd-rich-grid-items-per-row: 6 !important;)
youtube.com##ytd-rich-grid-renderer:style(--ytd-rich-grid-posts-per-row: 6 !important;)

! Using full page width for video grids
youtube.com##ytd-two-column-browse-results-renderer.grid-6-columns:style(width: 100% !important;)
youtube.com##ytd-two-column-browse-results-renderer.grid:not(.grid-disabled):style(max-width: 100% !important;)

I have it set up for 6 per row but you can change the number to be whatever you want.

I got tired of large thumbnails long ago. For anyone already using Enhancer for Youtube, you can add the following to the custom script section:

/* Add to Enhancer for YouTube's Custom script section */

;(function () {
    document.body.appendChild(document.createElement('style')).innerHTML =
        'ytd-rich-grid-row{display:inline-block;width:min-content;}div#contents.ytd-rich-grid-row{margin:0;}' +
        'ytd-rich-item-renderer{width:32rem !important;margin:1rem;}' +
        'ytd-video-meta-block[rich-meta] #metadata-line.ytd-video-meta-block{font-size:1.5rem !important;line-height:initial;}' +
        '#video-title.ytd-rich-grid-media{font-size:1.75rem;line-height:initial;}'
})()

you know those small pictures we call „thumbnails“ well because … thumb … nail … and they are all made for exactly that size.

Let’s make em yuge

Here's your occasional reminder to use FreeTube on your PC or Newpipe on your phone

https://freetubeapp.io/

https://newpipe.net/

I got this a while ago, it made me find the css variable and set it back. I have 5 across now, but could set it higher if I wanted.

You still get a few gaps where the shorts would be, if I didn't block those as well.

Why can't they make mobile UI design and desktop UI design separate?

If you haven't had enough reasons to use https://freetubeapp.io/, you seem to have found another one now

I use Control Panel for YouTube. Has a lot of features. Don't know how trustworthy it is. It has only 11k Users and 49 ratings on Firefox but I use it for some time now. YouTube rolled that out for me for weeks and when I got it, I didn't found a script to add to uBlock or so, when I got this bs.

You can use this extension if you're affected

I solved this problem by turning off watch history.

What browser are you using?

I am once again recommending freetube

Posy is my spirit animal.

This happened to me too and the Ublock filter fixed it. I dread to think of the day YouTube is made to be completely unfixable.