I have a column with horizontal padding

Column(modifier = Modifier.padding(horizontal = 16.dp)) {

every item need the horizontal padding except for 1 item in the col. Is there an easy way to "opt out"?

AFAIK there's no modifier that will just "do" that. You could just set the one item that needs to not have padding a negative offset of

-16.dp

but otherwise the solution would get more complex. I.e maybe a custom layout?

You could also create a base Modifier object, but instead of passing it to the column pass it to the children of the column except for the one that does not need the padding