Enable shell job control / don't catch Ctrl + Z

I like use my shell's job control features, but it seems Ctrl + Z is catched by gitui, so that nothing happens when I press it. Ideally, this would get me back to my shell, with gitui as a suspended background process.
For now, I quit and restart gitui when I make up my mind or want to context switch, which clears the non-git state such as the selection cursor.
I also don't really see where Ctrl + Z is used as a key shortcut, so it might even be unnecessary to catch it?