Specifying horizontal group column width

[yasirkula]

I'm trying to add a button next to a field. I've put both of them in a horizontal group. But the button takes up half the width of the available space. I want it to be a very small button. So being able to specify the column width in either pixels or percentage would be beneficial here. I believe there could be other use cases for this feature, as well.

[yasirkula]

Well, I didn't see that DeclareHorizontalGroup takes an optional Sizes parameter 🤓 It's exactly what I needed.