There are two ways to remove the contacts from the Automation.
I. Please apply a filter "Email is" and enter the email id of the contact that you want to remove from the automation. Once the contact is listed, select the contact, click on bulk action and select "Remove from Automation"
II. Please follow the below steps to remove the contacts from the automation
1. Create a Workflow
2. Add the node "Remove from Automation" and select the automation from the dropdown
3. Save the workflow
Once the workflow is ready.
4. Please go to contacts
5. Select the contacts that you want to remove
6. click on bulk action and select "Execute Workflow"