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;}'
})()

They also threw shorts at the top of the subscription section in the TV app recently. As if anyone wants to watch shorts on their TV. They don’t care though, it pushes shorts which is what they want to push right now.

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

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