One of the big factors in watering frequency is the root zone depth (RZD). Since you chose annuals the default RZD is 4 inches. I don’t know exactly what type of flowers you have. To give comparison, shrubs have a RZD of 15 inches so we water at a higher duration, but much less frequently.
If you’d like to start somewhere, maybe increase the RZD for your flowers (advanced zone settings) a couple/three inches to see if that gives you the desired frequency. Once you change the root zone depth on the zone advanced settings, you can go immediately to the moisture graph screen to see what the next two weeks of simulated watering data look like. Note by increasing the RZD this will decrease watering frequency but also increase the watering duration a bit. You can always decrease the watering duration through the schedule screen if you’d like. Hope this helps. Please feel free to ask any other questions.
This article helps explain how the flex daily settings work.
Here are your current zone settings: