hi how can I detect if a composable is in a visible area of the device screen?

You can use

Modifier.onPlaced

as it gives you a lot of layout information after the parent layout has been placed.

Modifier.onPlaced { layoutCoordinates ->
  val (x, y) = layoutCoordinates.positionInParent()
}

in a

Row

or a

Column

layout, a positive

x

or

y

value means the composable is within the bounds of its parent. A negative value means the composable is going out of view.