You’ll need to take some extra steps to properly setup drip – namely converting gallons per hour to inches per hour (aka Precipitation Rate aka Nozzle Inches per Hour in Advanced Zone settings).
For my personal method (diverges from post I’m linking to below), it is important when computing gallons per hour to inches per hour to not use the square footage of the entire zone. Instead, use the square footage for the average plant’s drip line area (or largest plant or most important plant). Basically you’ll figure out the inches per hour for a single plant area or the average plant area and enter that and that value will be used for the entire zone.
https://support.rachio.com/hc/en-us/articles/115010379587-How-do-I-calculate-my-precipitation-rate-