How to set SButton fixed size Width and Height (not padding)?

nothing helps… my button is always about 200 width 200 height in pixels. its very big and square and i can’t set it’s size, even if change padding. There are no WidthOverride and HeightOverride arguments.

can you please give me full example?

I need something like UE4Editor->Edit->Project Settings…->Description (Buttons Export and Import). Omg that buttons so perfect, they have constant size, and they do not change size when i resize settings window. I love that buttons, but i cannot understand how they work. I use WidgetReflector, i do exactly the same code, and i get nothing similar.

PS: i didnt met so hard and unintuitive GUI functionality in my life.