I am in Northern California and have similar drought tolerant plants in my yard. I am using the flower bed setting because my irrigation is set up by location in yard not by the plant on the zone. Since I have both drought tolerant perennials and shrubs on a zone, I have to water for whatever has the most need. The shrub setting may work for you if you don’t have any thirsty perennials mixed with the shrubs.
If you do an internet search for “Rachio community” “advanced setting”, you will find what you are looking for. Here is an article that is in depth and I found helpful: