We are using 4 communities, currently, all the communities using the login flow. I want to Stop it from triggering for a particular community. Is it possible?
What you can do is detect which community you are in during the Flow and bypass the rest of the Flow if the community is the one in question.
There are a certain set of standard variables you can add to your Flow as input variables. If they exist with the proper name and are available as input, when the Login Flow is executed, they will be populated and you can use them to customize the behavior.
LoginFlow_LoginType LoginFlow_IpAddress LoginFlow_UserAgent LoginFlow_Platform LoginFlow_Application LoginFlow_Community LoginFlow_SessionLevel LoginFlow_UserId
LoginFlow_Community is the one that will tell you which community the user is trying to log into.