How to Limit Domains to Log on to?

How to Limit Domains to Log on to?

SD locates other domains and Workgroups on the network than the two domains I manage. Also, I have implemented AD authentication for users to access the SD web portal. My question is:

How can I limit the domains/workgroups that the users have see in the "Log on to" drop down menu when they log into the SD web portal? Currently, I delete the other domains and workgroups when they appear in the Domains list but they keep reappearing.

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