I created a filter for a date range, and saved it as a “Smart Folder”. But the first and last images are not right as far as I can tell. So I thought, oh the sort order. But the sort feature is disabled. I looked and looked…
If you create a Smart Album, then sorting is allowed. I just looked at the app and the sort interface is enabled for a Smart Album that I made. If I click on the “Smart Albums” folder, then the sort interface is disabled, but that is a designed. So, I do not know why it is not enabled in your case. Perhaps if you quit and restart the app?