This was so infuriating when Mojave came out. I went with this method,
reassigned "Show Original" to cmd-R specifically for Finder.
Do you have an existing Symantec Endpoint client installed like an
older, non-cloud based client on your test Mac? I've found and others as
well, sorry can't cite a specific thread about it yet, that the previous
client has to be uninstalled first be...
To be clear are you talking about the per site 'Ask' or allow for All
('On') setting for the Flash plugin? Where if it is set to 'Ask' the
sites will appear in the list (as seen on the screenshot). Though I've
encountered sites where no prompt appear...