The current ure_caps_list_container is getting it’s min-height and max-height values set. When there are a lot of capabilities, this results in a double verticle scrollbar which makes it difficult to scroll through the list. As a quick test, I tried applying:
That gives a much-improved scrolling experience – especially with the recent update that only shows the relevant capabilities when the quick filter text is used.
It would be great to have the max/min-height of the container set to auto and not a specific value so it dynamically adjusts to the number of capabilities as the filtered list changes. So it would only have a height of something like 8,000px when the All or Custom Capabilities category on the left nav was selected. For example, this would make it fast to leave the default to All and search on Publish and have a simple scroll experience instead of the double scroll bars.