That is expected. You can see the definition using a Quick Definition action - Alt-Space on macOS and Ctrl+Shift+I on Windows and Linux.
Cmd-hover only shows very basic info about the symbol - what it is (interface, class, type, etc), where it is defined and the type. We intentionally don't show there the properties of the interfaces, fields and methods of the class, etc
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Please report a feature request on our issue tracker: https://youtrack.jetbrains.com/issues/IDEA Thank you!
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