How to fill panel widget with a created widget?

I am adding a widget created with Create Widget to overlay.
This overlay need to be filled by the widget when it is added, but I can’t find a way to do that.
Yes, normally widgets added directly to a panel can be filled with alignment settings.
But how can I do that in the created widget?

Fill rules are not properties of the child widget, but those of the Overlay Slot that hosts the child:

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This is exactly what I was looking for.
I searched many times for related words but couldn’t find it.
So I used Named Slot instead. This is set to fill by default.
I’m wondering why the overlay isn’t the same.

Named Slots are special and they are also designed to hold 1 child only - I guess you will always want to fill them. Why overlay slots fill rules default to what they do? No clue, but most other slots behave the same, afair. :person_shrugging: