If you are looking for the Custom Field, Validation Rule, Business Process,  Weblink (Custom Buttons) or Record Type in the comparison results, they are classified as sub-components of the parent Custom object (note that in the API terminology Standard Objects are also Custom objects).

Find the Object first (hint: it may be in the All Items tab) and then expand the components to find the sub component you wish to deploy!

See this example for finding the Custom Fields of my test object:

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