Hi Nazia,
To add onto the previous posts, with system options as mentioned in the KB, try adding the team members to a project ,as a Collaboration Manager. Or set the option - Automatically Add Staff Members As Investment Participant , to Never and check the same.
In case if you are getting any errors on the UI, you can mention those, also check on the app-ca log, when you are carrying out the actions, in case the above mentioned details does not work.
Regards,
Samik