By selecting the Membership Revoke Offer workflow action, you can remove a contact's access from a particular membership product.
In order to PUBLISH workflows, you will need to establish a workflow trigger and a workflow action. Without both, you will only be able to save the workflow, not publish it.
How to Revoke Offer
To initiate the process of removing a contact from a membership product, start by clicking on the + symbol to add a new workflow action and pick Membership Revoke Offer. Next, select the desired membership offer from the drop-down menu that you want to revoke contact access to within this specific workflow. Once you’ve selected the offer, make sure to rename your workflow action accordingly and click the Save button in the bottom right.