Can't view whole model within a group or component

I am working on several models at the same time and switching between windows. For some reason, in one of my models when I open a group or component, the rest of the model entirely disappears and cannot be referenced at all. It is so annoying. Another model behaves as I expect - I can still see the rest of the model ghosted when I open a group or component. I need to be able to reference the whole model when altering a group, so what is happening and how can I fix it?

View>Component Edit>Hide Rest of Model

Many modelers set a hotkey for this function, to turn it on and off at will.