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There seems to have been a YouTube update a few hours ago which broke the display of videos in the list view:
They're now displayed in enormous / full-width size.
I've analyzed the issue: YouTube recently changed several CSS class names (switching to a camelCase format), which broke the selectors for this script.
I have submitted a Pull Request with a fix that supports both the old and new class names.
For those who need an immediate fix:
I've created a Gist with the patched userscript. You can copy-paste it into your userscript manager until the official one is fixed: Fixed for YouTube update April 2026
There seems to have been a YouTube update a few hours ago which broke the display of videos in the list view:

They're now displayed in enormous / full-width size.
I've analyzed the issue: YouTube recently changed several CSS class names (switching to a camelCase format), which broke the selectors for this script.
I have submitted a Pull Request with a fix that supports both the old and new class names.
For those who need an immediate fix:
I've created a Gist with the patched userscript. You can copy-paste it into your userscript manager until the official one is fixed:
Fixed for YouTube update April 2026