<How to keep a Mutable List with the previous data...

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How to keep a Mutable List with the previous data added in a view Model class in Kotlin?
I have two classes: one is the viewModel (ShoesViewMode.ktl) to keep the data and the other is the Fragment to show the data.(ShoesList.kt )
ShoesList has a mutableList of words and I recover it from the ShoesList to show in a scrollview.
I get a new word from an EditText from a Fragment -> Click on Save button -> Pass this word through nave Args to ShoesDetails -> save it in the ShoesViewModel -> Recover it and show in the Fragment.
The problem is that every time I add a new word, the list...