I have a section in a space that I want to reorganize in a reverse sort.
1) When I navigate to the Reorder Space tool, I get the sort symbol

2) but when I click the Sort Alphabetically symbol, the symbol just changes to the undo arrow, but never sorts:

Clicking the undo arrow, just changes the symbol back. I've tried waiting, thinking maybe it just takes time to sort, but it never does.
I've been able to reverse sort other sections, but not this one. Currently the number of pages I want to reverse sort is 21 pages.