Google is testing a sort by button filter at the top right of the Google Shopping interface. This is instead of Google putting the sort by on the left-hand bar, with all the other filters.
This change was spotted by Sachin Patel who posted some screenshots on X - I was able to replicate it in a browser window, here is what I see:
This is how the sort by filter normally works on the left hand side:
I guess Google wants to know if people want to sort more?
Forum discussion at X.