Don't do both. You can set a schedule, and it will automatically enable/disable according to the schedule. When you turn it on manually, it enables immediately. That does not enable/disable the schedule as you seem to think it does.
Thanks. This seems to have solved half the issue. I tested it by setting a schedule and saw that the moon icon appeared but the calls were not silenced. I tried calling from my desk phone which is not in my favorites and the phone rang while the moon was on display.