YouTube changed the description box below the video.
This script tries to revert to the old proper description style layout as well as the one without the side bar.
Note:
Install if your description has changed to the compact version or the 'show more' button opens in a side bar and you want to bring it back.
There is no need to install this if you still have the original behavior (Unless you want to be prepared).
Additional:
In versions prior to 1.1.0 I had a wider description expander button (shown in screenshot 'after').
If you like it like that, you can install that as a new userstyle using Stylus extension,
here's the code:
#meta ytd-video-secondary-info-renderer,
#primary #meta #description_open,
#primary #meta #description_close { border-color: rgba(0,0,0,0.125); padding-bottom: 0; border-bottom: none; }
#meta ytd-expander.ytd-video-secondary-info-renderer,
#meta ytd-expander.ytd-video-secondary-info-renderer > * { margin-left: 0; }
#meta #description_open, #meta #description_close { width: 100%; border-top: 1px solid; border-radius: 0; text-align: center; cursor: pointer; margin-top: 1em; background: linear-gradient(rgba(0,0,0,0.02), transparent); }
[dark] #meta #description_open,
[dark] #meta #description_close { background: linear-gradient(rgba(255,255,255,0.02), transparent); }
#meta #description_open:hover,
#meta #description_close:hover { background: rgba(0,0,0,0.03); }
[dark] #meta #description_open:hover,
[dark] #meta #description_close:hover { background: rgba(255,255,255,0.03); }
#meta #description_open .desc_text,
#meta #description_close .desc_text { margin: 0; padding: 4px; }
Another thing you can do is send feedback directly to Youtube that you don't like the new changes.