This is strange, because it happens on the older Pro as well, at least for me. I tried on three different installs:
I tried to scroll to the last CSS Grid Layout, but I cannot.
When I get to the second page, the Offset Masonry is the last one with the arrow on top of it. I cannot click that arrow, nor the arrow to go left appears. If I expand the screen eventually I can see the last layout, but still no arrows.