There are various reasons why you may want to restrict access to your portal- the user left the company or is no longer on the partnerships team, etc. As a Partner Account Owner, you have the option to Suspend that user.
Who can do this: Partner Account Owner
Suspend a team member
Go to Portal Settings in the sidebar and select Team.
Find the team member and click the edit button next to their name.
In the pop-up window, open the Status dropdown — it should currently show Active.
Select Suspended and click Save.
The team member is now suspended. They will receive an email notifying them of the change and will no longer have access to the portal.
Reactivate a suspended account
To restore access, follow the same steps and set the team member's status back to Active.
For more information on Team Member's visibility, check out this article.