In Grafana v9.1.5 (df015a9301), I cannot find a menu for creating another folder in “Alerting”:
In “+ New alert rule” > “3. Add details for your alert”, I only can choose one of folder already exists:
Where and how can I add a new folder for alert rules?
In order to add new alert folder you just have to start typing in
Folder field (showed on your 2nd picture) and after that press enter while your cursor is still in that field.
Thank you for the answer and it works, but what a poor UI I think.