Parameter Information
Whenever you are studying a function call, Rider helps you view details on the allowed arguments for all overloads of the function. In a tooltip, you will see all public signatures with parameters and brief description taken from the function's XML documentation, if any.
Using Parameter Info
As you are typing parameters, Rider automatically highlights the next signature compatible with the entered parameters, and grays out inapplicable signatures.
To study alternative signatures of an existing function call, set the caret inside the function's parentheses and then press Ctrl+Shift+Space or choose in the main menu.