WorkSpaces Manager allows you manage WorkSpaces across single, or multiple, AWS accounts. When you set up WorkSpaces Manager, you will set up a single account. You can set up multi-AWS accounts by enabling this function and following the instructions WorkSpaces Manager Administrator Guide
You will see a summary of the Account ID(s) once they are added.
Select one and you will see the options. These can be toggled on or off (like Dry Run mode) if required.