we've discussed this matter and came to the conclusion that the text "Default" correctly describes the situation in this context. It means, that the chosen ruleset is activated on a number of given devices. Opposed to normal global definitions (e.g. networks), you cannot have multiple rulesets deployed on the same device; there is only one ruleset which becomes the "Default" setting.
Ok, this is then different like in the other pages and so I can't lokate the device with an error or offline when transfer the ruleset (see screenshot). In the other screen views I can see it.