Material

Button

applies some inset even though

elevation

+

contentPadding

is set to zero.

Button(
        modifier = modifier
            .size(46.dp)
            .padding(0.dp).background(Color.Green),
        elevation = ButtonDefaults.buttonElevation(
            // all zero
        ),
        shape = RoundedCornerShape(13.dp),
        contentPadding = PaddingValues(0.dp)
    ) {
        Icon(
            painter = iconPainter,
            contentDescription = contentDescription,
            modifier = Modifier.size(20.dp)
        )
    }

gives me

Not sure, just a guess but I think thats enforced LocalMinimumTouchTarget size (48 dp)

oh, thanks. wasn’t considering that 🤔

You can disable that by overriding

LocalMinimumTouchTargetEnforcement

composition local on your button

thank you - that was actually the cause. 👍