Want to change its background color by using 'Modifier.background()'

[PolyOxyethylene]

In traditional Compose DropdownMenu, menu's background color can be changed by Modifier.background(/*certain color*/)

However this doesn't seem to work on CascadeDropdownMenu, its background is only decided by the theme of the application.

[saket]

Yep, this is because cascade manually draws the background color between menus to prevent their content from leaking into each other. A better solution would be to clip the canvas of sub-menus, but I haven't found an easy way of doing that yet. In the meantime, modifying the theme is your only option.

MaterialTheme(
  colors = MaterialTheme.colorScheme.copy(surface = …)
) {
  CascadeDropdownMenu(…)
}