How to solve the problem with a failed PC assembly (incompatibility of the motherboard and case)?

Question

Frame

Bought all the components for a new PC. But there is a problem: the ASUS ROG STRIX Z390 H GAMING motherboard could not get into the MSI MAG PYLON case.
The cutout in the case for the motherboard connectors is narrow. How to solve the problem or choose a new case?

Answer 1

Let's not engage in stupid guesswork on coffee grounds and exercises with a hacksaw in the spirit of a shovel-caveman, but find out which of the manufacturers deliberately neglected the standard.
The ATX chassis standard says that the size of the IO Cutout should be, rounded up to the nearest integer - 159x45mm. Arm yourself with a ruler and measure.

Answer 2

I do not quite understand what kind of connectors in the case are we talking about? if about a place for the back plate, then there should be a standard rectangular hole for an insert with holes for the motherboard connectors, which comes with each motherboard.
If, nevertheless, this is something not standard, then take a hacksaw for metal and saw it.