I love the new platform & this has probably has been raised by someone else already undoubtedly.
However my search skills have failed me, so I thought I'd post this just in case.
In the old platform, it was possible to sort by column within a Watch-list window. This seems no longer possible - on the ones that slideout from the sidebar I must add. Hovering the mouse over "By, Change & %Change" doesn't provide a cursor or an action once clicked.
Sorting isn't a must, but it's certainly a nice UI feature which I thought would be in the new platform.