In psuedocode:

if(model.shouldShow()) { // Doesn't show/hide
 Text("Title")
 TextField(...)
 Button(...)
}


Text("Title")
TextField(...)
if(model.shouldShow()) { // Does show/hide
 Button(...)
}

Actually, I guess I'm misunderstanding something. If there's something that triggers the TextField to update, then it will work, but otherwise it doesn't. I do understand that the boolean needs to be observable for the UI state to change, but I'm passing the boolean from a function, which is checking whether a list has > 0 items, and I'm not sure how I would make that observable.

You don't need to use derivedState just to propagate change notifications, although it will save unnecessary recompositions once the list is non-empty.

Those gists reflect the state of the code without the mentioned modifications above. I have tried derivedStateOf and tried using MutableState, though I don't see any changes to how things function by doing that.

I assume nothing needs to change in the other gist; I have other areas of my code where I've used mutableStateOf without issue so that's why I'm a little confused here; those other areas of code don't deal with lists/sets in this way though