Regarding the first question, I will leave it to Samer because he is more familiar with the weather station and the UI.
About rain sensor, please check the user manual -> page 14, the answer to question ‘What’s the relationship between Rain Delay, Rain Sensor, and Weather-based Adjustment?’
https://opensprinkler.freshdesk.com/solution/categories/5000022938/folders/5000147083/articles/5000522596-user-manual-firmware-2-1-1-current-