Note: if you wish to delete Artist/Crew from your project, check out this article.
If you wish to delete a user from your Artist PRO account, check out this article.
Delete a user from your Agency account
It's very easy to delete the users from your Agency environment.
Note: this won't effect your data; if you delete a user, the data will remain in your environment, it's linked to your account, not to the user.
You can find Team Management under the "Office" section by clicking the icon.
Next, select "Team Management"
You will get a list of all the users in your environment. If you have permissions for Agency Office for Administrate, you can delete a user.
You can find the bin-icon next to their names:
If you click on it, a pop-up will appear:
Click on the red 'Delete user'-button and the user will be deleted. They won't have access to the Agency account anymore.