What action is taken to start recording a macro?

To initiate the recording of a macro, the appropriate action is to click the Record Macro button. This button is specifically designed to start the macro recording process in spreadsheet applications and similar software. When this button is clicked, it allows the application to capture all subsequent actions and commands performed by the user, which can then be replayed later to automate repetitive tasks.

This functionality is crucial for enhancing productivity as it enables users to create a sequence of commands that can be executed automatically with a simple trigger. Recording a macro eliminates the need for manually repeating a series of steps, thereby saving time and reducing the chance of errors.

The other options do not serve this purpose: stopping a macro cannot initiate a recording; adjusting macro settings involves configuring parameters or permissions but not starting the recording; and using the Save As button traditionally focuses on saving files rather than starting any macro recording.