Use the Change Signature&shortcut:ChangeSignature; refactoring to add, remove, or reorder function parameters, change the return type, or modify the function name. Change Signature affects all the usages of the function, including calls, implementations, and overriding replacements.

For example, in the code fragment below, you could place the caret within the function signature and press &shortcut:ChangeSignature; (Refactor | Change Signature):

Make all the necessary changes to the function signature and check the preview: