Greasy Fork

Thanks for the script!
Even if the number of videos is not a multiple of 3, the layout will not be broken and cause confusion

Hi Leadra, I recommend you to use my extension instead, I'll not support this script, it was just to test if the code was working well before updating the extension's videos per row feature:

Firefox: https://addons.mozilla.org/en-US/firefox/addon/youtube-tweaks/
Chrome: https://chromewebstore.google.com/detail/youtube-tweaks/oeakphpfoaeggagmgphfejmfjbhjfhhh

Video grid > Elements per row

google trans
It turns out that Chrome also provides it!!
Thanks
Can Watch page also provide Dim watched videos?

Hi, doesn't 'Dim related watched videos' option works for you?

I use chrome and cent browser
Hiding or dimming has no effect
But it is OK to hide short, etc.
Hide related live streams
https://www.youtube.com/watch?v=5HeKU1cgrYY

Is it related to Taiwanese Traditional Chinese?

No, I think this is due to a YT update that they didn't pushed to me yet. Unfortunately, YT can't keep their site alone ;-;
Ty for letting me know.