Like Ric Turner who originally asked these questions with an older version of AF and Explorer more than a year ago, I would also prefer that the timezone and time from GMT not be displayed.
The previous discussion was here:
How would the same time format changes be made using 64 bit PI System Explorer 2017 R2?
There is no longer a PIANO default element. Would I need to add the time format separately to each element that has a notification? Or for each database, would I need to add a top level time format, for use by all elements in the database? Could I make a global notification format (for each database? for all AF databases?) and have the individual reporting formats inherit the time format from the global format?