I have the following layout:

Row {
    ComponentA()
    Column(modifier = Modifier.fillMaxSize()){
        ComponentB()
    }
}

how can I align the ComponentB to bottom right of the Column? I'm trying to achieve something from the image attached

You can use Box as root layout and use the align modifier in the childs

You can also consider ConstraintLayout for compose if you need more fine-grained positioning.

This is a specific usecase, but you could do this if you wanted.

Column(modifier = Modifier.fillMaxSize(), verticalArrangement = Arrangement.Bottom) {
    ComponentB(modifier = Modifier.align(Alignment.End))
}

Columns and Rows also allow alignment in their cross-axis space.

Thanks everyone, the box approach worked