Remove "Alternative switch to next source" keyboard shortcut?

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During the installation of Fedora, I set two keyboard layouts: Norwegian and English. I was asked what shortcut to define for switching keyboard layouts, and I set it to Ctrl+Shift. Now that I have installed the Atom IDE, I cannot use Atom's shortcuts such as Ctrl+Shift+A (Add new project), etc. so I went into Fedora's settings menu (Settings->Region and Language->Input Sources Options) and it said go to keyboard settings. So I go there and go to remove the shortcuts, "Alternative switch to next input source" is not in the list, just "Switch to next input source" (Super+Space). How do I remove the Ctrl+Shift shortcut? Thanks in advance :)