I use the comments a lot. With this new update, you can't use [space bar] to grab and scroll in the comments section, like you can do in the section on the left where your document is.

And the arrows don't work well either, because if you use them in the long list of comments, they jump further in a way you get lost!

If the scroll bar wasn't hidden and a bit wider in the comments section, this would solve this problem partially. Using [space] to grab and navigate would be best. I think it was like that before...