How can I remove/hide HELP CENTER link from Customer Service Desk portal?

[Thorsten Scholz]

was looking for the answer to the same problem. 

Scenario:

3 different clients with Help Desk access. They can log in to the URL (external URL) which redirects to

...atlassian.net/servicedesk/customer/portal/1

...atlassian.net/servicedesk/customer/portal/2

...atlassian.net/servicedesk/customer/portal/3

etc

However they can use 

a) smart search

b) "Help Desk" link on top of page

c) the master URL (...atlassian.net/servicedesk/customer/portals)

to switch between the portals.

It appears that this is solved by this thread :

https://answers.atlassian.com/questions/32970687

The key item is that under portal admin the client support portals require:

• Request security

to be set to

• Only people on my customers list can raise a request