To cancel a running task on PowerShell you can use either Task Manager or the Windows Console.
Note: In both cases, ShareGate Migrate does not undo what has already been migrated.
How-to
Task Manager
To cancel a running task using Task Manager you will need to:
Open Windows Task Manager by clicking Ctrl, Alt, and Delete simultaneously.
Select Windows PowerShell from the list.
Click End Task.
This will close PowerShell and kill the running task.
Note: The task may still appear as running on ShareGate Migrate even though it has ended, this is normal behavior. You may need to restart the application for the task to appear as canceled.
Windows Console
To cancel a running task using the Windows Console:
Select the keyboard shortcut Ctrl+C.
After a delay, the task will end.