You can cancel data import using the schedule definition of the data connector or by using the jobs page.
Cancelling by Editing the Schedule in the Data Connector
You can remove or change the time that the input transfer is scheduled to execute.
Navigate to Integrations > Sources.
Select the ellipses.
Navigate to the Data Placement page.
Edit the Schedule. For example, select Off.
Cancelling Data Transfer Using the Jobs Page
This option is only available while the job is running.
Navigate to Jobs.
Filter for the job that you want to stop.
Select the job.