Size box clipping

I try adding multiple items as Childs to my size box. The issue is I want to clip anything that is outside of my size box. I have used the override for the width and height so that the box stays the correct size and i set the clipping to clip to bounds. For some reason it still doesn’t clip and i was wondering if it was even possible to clip a with a size box

try adding multiple items as Childs
to my size box.

The Size Box widget can have only 1 child so you’re doing something else. Could you clarify? Do you have another container in the size box, to which you add children?

As in, under regular circumstances, this clips fine:

Image from Gyazo