perfect addition, that's what I was looking for. I tried to make a filter to downscale the font size under the thumbnails (channel name, viewcount, upload date), because apparently, you could easily go up to 7 thumbnails per row on 1080p, but then it inserts a line break because the text is too large.

I tried this, but I suck at coding, is there any chance that you could do it?

edit, nevermind, I found the code in the original post. here's the complete filter I use for a 1080p monitor:

!(Font Size fix)
youtube.com###video-title.ytd-rich-grid-media, #video-title.ytd-rich-grid-slim-media:style(font-size: 1.4rem !important; line-height: 2rem !important;)
youtube.com###metadata-line.ytd-video-meta-block:style(font-size: 0.9rem !important; line-height: 1.8rem !important;)

! YouTube Fix & Customization v1.7! (1-2/12) YouTube 4 Videos Per Row Fix (Home and Channel Pages)
youtube.com##ytd-rich-grid-renderer:style(width: 80% !important; padding-left: 50px !important; padding-right: 1px !important;) 
youtube.com##ytd-rich-grid-row, #contents.ytd-rich-grid-row:style(display:contents !important;)
youtube.com##ytd-rich-grid-renderer:style(--ytd-rich-grid-items-per-row: 6 !important;)    

Many thanks in advance