The answer given by Jan Itor is correct. With your code, the composition is happening only once, so the layout inspector is not showing any recomposition at all.

In short, rendering a composable involves three phases, namely, Compostion, Layout and Draw, and if only layout is changed, re-compostion will be skipped.

The second link (which is provided by Jan Itor) has another link to a very short blog, which is explaining the same thing with a very short video. If someone wants to grasp it quickly, here is the link - https://medium.com/androiddevelopers/jetpack-compose-debugging-recomposition-bfcf4a6f8d37, watching only the video can also work.