Hi. I am new to this myself and have only had the system for about a month. I currently have only three zones and have set them up for daily morning watering. I have smart zones disabled in each zone.
Under Preferences / Settings - it has a Weather Conditions area.
Under Rain I have the Strategy set to Expectation,
The Threshold set to 5mm (I actually think I should reduce this to something like 2 or 3mm)