GUI Script eats Input of Brackeys' Inventory System

Hey there,
I have a problem, regarding the GUI processing order.

In my Scene, there is a Empty for my whole GUI, which works fine.
In my Testscene I set up the Inventory System (Multiple Windows with Buttons) and it worked fine. However in my new Scene, the whole Input gets eaten by the GUI-Empty.

Changing the GUI.Depth didn’t fix the problem, since it just moves the Objects behind each other.

So, how can I fix it?

Thanks, Joker

NVM, got it. The Option I wanted in the Projectsettings.
Careful with that btw, any more than 200 interrupts messages (atleat in my Project).