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How can I manage layout programmatically in my app? I want to add more columns in a row with specific component inside by button click. How can I do it?

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Are you trying to do a mobile or desktop app? <#C01D6HTPATV|compose-desktop> would be better for the latter.
If you are not familiar with Compose, then I would recommend starting with the <https://developer.android.com/jetpack/compose?gclid=Cj0KCQiAjc2QBhDgARIsAMc3SqSjVHA4bOcPcFkFxY9L2DrDF_7prrimRBoMxTUx1uPgijQ2TVoDzdcaAkFPEALw_wcB&amp;gclsrc=aw.ds|official documentation> by Google.

The basics of Compose are the same for Android and desktop so the official tutorial is your best bet :) 
There are also nice examples of desktop specific stuff in the Jetbrains compose Repository on GitHub

this is a very general compose question so this is the right channel for this :slightly_smiling_face:

possibly _the_ getting started with compose question since it speaks to a fundamental difference of declarative toolkits

the way to do this is to define your UI in terms of your data. You have a list of modules somewhere, so your UI code becomes:
```Row {
  for (module in modules) {
    key(module) {
      ModuleColumn(module)
    }
  }
}```

It is smart enough to detect changes in modules array and redraw UI ?

if you're using an observable collection like that returned by `mutableStateListOf()`, yes

alternatively, if you're using immutable collections of some sort and something observable emits new copies of the list with changes, that's also fine

Where I can read about app state ? For example how I can save app dimensions and when user close app and start it again it restores it position and configuration (height and width)

I came from angular so i trying to match that experience

the info at <https://developer.android.com/jetpack/compose/state> might help, if you're working on desktop then ignore the parts where it talks about parcelize/androidx ViewModel, the rest of it about state holders all still applies regardless of platform

this whole article series is also good: <https://dev.to/zachklipp/a-historical-introduction-to-the-compose-reactive-state-model-19j8>