I need to provide in-app dark and light theme feature. Currently, I am changing theme using

isSystemInDarkTheme

but how to change theme using user input ?

Just have a separate value stored somewhere that switches the colors of your theme (e.g.

MaterialTheme

). e.g.

var userWantsDarkTheme by remember { mutableStateOf(false) }
val colors = when {
    isSystemInDarkTheme() && userWantsDarkTheme -> darkColors()
    else -> lightColors()
}
MaterialTheme(colors = colors) { Content() }

Thanks