What's the Meaning of Public Zone on RT90 RT82 RT3S Software

When we check it. your radio will only support same zone one time on band A and band B. When we uncheck it, your radio support two different zones. Such as, band A is zone 1 and band B is zone 2. In other world, uncheck the Public Zone, You radio will support to set band A/B zone separately. When you check the Public zone, it won't support.