revoke Power BI Pro trial

Hi,

I"ve recently started using Power BI. I wanted to try a pre-built app & the Power BI Pro 60day trial licence got activated automatically. it never asked me before activating it, neither did i know before hand that it gets auto activated. I want to turn off the trial period so that i can explicitly activate it when i think i'm ready to try Pro features. Any help in turning this off is appreciated.