I don't see it at first when I come into a page. But if I scroll up and down a couple of times, a blueish box with an upward arrow appears in the extreme lower right-hand corner.
The problem might be that I am accessing the site on my PC. So I have a huge window to see the board. If you are on a phone, it could be limited,similar to what others had mentioned a few weeks earlier about not seeing post numbers. If you are on a phone, trying viewing the site in landscape mode.