Ok thanks - it makes sense now.
Only thing that is strange and unintuitive is that you can search for them in the print settings list, only to find the category they belong under. I guess that it is also strange that they can be set to visible in the settings, without any explanation why they will not be visible.
These settings are meant to be used with the "Per model settings" tool. They would have no function in the Print settings list, which is why you cannot make them visible there. The "support mesh" setting automatically gets set for settings you mark the be printed as support.
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