Your Collaborator Profile is set to private by default. A private profile is not visible to other Collaborators using the Collaborator or Publications Search tools.
Some communities will have a Community Forum. You also won’t be visible on the Community of Practice Forum, unless you decide to engage with it (i.e. comment, like, post). Once you interact with the forum content, other collaborators will be able to see you on the forum and send you private messages.