You may want to send feedback to Apple with a feature request.
It seems to be a new, unfortunate feature - none of the views in the redesigned Photos: Years, months, days, all Photos, is showing the titles or filenames at all. Currently we can only see the titles in the albums we create ourselfs, or in Imports and Recents and the Media Types albums.
Use this form: https://www.apple.com/feedback/photos.html
I am also using the work-around suggested by OT. But I am just using a smart album based on the date range "Date Captured is in the range ....". Whenever I want to see the photos for a recent shooting session I simply modify the date range in this smart album. This way I get the Moments back, that are also gone from Photos.