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Buttons don't work inside vertical boxes.

I want to make inventory on half of the screen and something else on the other half. So I made horizontal box on whole screen, inside it two vertical boxes. When I place button in canvas panel it works, in horizontal box it works, but in vertical box it doesnt work. Does anyone know why?

Can you double check that the Vertical Box’s visibility is set to Self Hit Test Invisible or Visible.

I’v tried both.

Well… f** it. I’m making inventory again from start.

Could be related to your Anchor settings and the layering of the UMG items.

Yeah I’m stupid. I forgot that I have transparent button on whole screen.

Take a look at the widget reflector, it’s a very handy tool in tracking down problems with hit testing.