I’m sharing a flat with friends in India, but my name isn’t on the lease. Now I want to move out, but my friends are preventing me. Can I legally leave the flat, and will this impact the other tenants staying there?

Yes, you can legally leave the flat even if your name isn’t on the lease. Your friends cannot legally prevent you from leaving. Your departure will not directly impact the other tenants’ tenancy, but it could affect their rent obligations if you were contributing to the shared expenses.