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But yes, if a mother component/group is on a hidden layer, you won't be able to see the nested components/groups, regardless of their layer.

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I understand how layers are supposed to work in SU, and there are some advantages to the implementation. But I find this aspect can cause issues, even when following the good advice above. For example if I have a large project, organised into groups and components it is often needed to bring new elements of a cad import (raw geometry on layer 0) into groups / components to update them. It would be useful to be able to isolate (visually) the different parts of the cad import by a layer regardless of the groups i've put them into but the system seems to prevent this. Is there a script to ignore nesting and show visibility just by selected layer or does the way SU separates groups make this undoable? Thanks for the help.