How do I remove the below fields (probability & close by) from the opportunity screen:

I had thought I would retain the information as I know we did this. Below are the steps I thought I had to take.
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Administration
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Customization
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Opportunity
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Fields tab
This is where I get lost (see below). I clicked everything in the below circled but couldn't find a way to remove the field from the tabs.
Please point me in the right direction.
Thanks
Rob

