With InVision, you can remove a collaborator from most* prototypes at any time.

*Currently, it's not possible to remove collaborators from a Studio prototype. 

To remove collaborators from your prototype:

1. Open your prototype and, in the top-right corner of the prototype homepage, click the avatar of the collaborator you want to remove.
2. In the Invite people to project modal, de-select the checkbox next to his or her name.
3. Click Update.
   Note: If you do not have the InVision Enterprise plan, you will click the Remove 1 Person or Remove [X] People button to confirm your choice.

When you remove a collaborator from a prototype (or remove them completely from an account), their comments remain on the prototype.