Sync contacts for non admin user

Hi, I'm the admin of my company's campaigns and CRM account, and I have to more user under my account. None of them are admin in Zoho CRM or in Zoho campaigns. They are the one using the campaigns not me. I just the admin. They need to be able to sync only their leads, meaning userA can only see his own leads and userB can see only userB own leads. Is it possible? Right now, when they create a sync and choose "my leads" they only sync my leads (admin) not theirs.

thank you for any help.

Daniel