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 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.

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

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?

You can use this extension if you're affected

What browser are you using?

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.

I am once again recommending freetube

I solved this problem by turning off watch history.