Again to be painfully clear.
After ZD mesh enabled did the APs restart?
[the dashboard widget "most recent system activities" should list all your restarted APs,
screenshot shows one of mine has recently restarted...]
Then in ZD you should be able to edit the individual APs (yellow outline appears around frame - as in my first post pic) advanced section.
If not then not sure what is missing. This becomes "odd behaviour" and might be beyond merely navigating the quirks of the gui. Tech support next stop.
ps: my sanity went a long time ago, fortunately it went all at once and I never noticed.