Have you tried clicking on those options in the drop-down menus to activate them? If you click on Details in the View menu, options that were greyed out will become active. Also, Updates in the Help menu is only active when there is an update available from Adobe.
Your suggestion to click on Details in the View menu essentially did the trick. My main problem was that I didn't seem to be able to expand the stacks to show the different edited versions of a photo. Activating the Details button now shows me the little expand/contract arrow to the right of each shot, as I was used to in PSE 12.
My main problem had been a seeming inability to see the various versions of the many edited photos in my catalog. Someone else alerted me to activating the "Details" button on the View menu and that has solved my problem. I had been using PSE 12 and so was used to seeing a small expand/collapse arrow to the right of each edited shot. Using the Details view, I now see that arrow again!
Understood re the Update button. Nice to know that I am up to date!