How to reload layout after ComboBoxString's size change?

I want to increase the font size of ComboBoxString. Since there is no way to do so, I’m following a post that suggested to put the combo box inside a Scale Box and use it to scale the whole thing.

I have the blueprint doing that but the problem is that the combo box doesn’t update that it needs more space on the UI now:

obraz

I’ve tried calling InvalidateLayoutAndVolatility on the Combo Box, Scale Box or the parent Panel but none of that fixed it.
Here is my setup for the Scale Box:

obraz

I’m still fighting, thought I put some update here.
I tried calling InvalidateLayoutAndVolatility on the entire canvas.
Tried removing and then re-adding the ScaleBox. Tried that also with the ComboBox itself.
Tried calling ForceLayoutPrepass on the ScaleBox.

It seems as though if the ComboBox would be holding information that it desires some specific size, which is now incorrect. I don’t see any way of setting PreferredSize or anything like that in blueprints though.