Prathy Kamasani shows us how to recover lost Power BI desktop reports:
A quick post, how many times in Power BI Desktop, have you clicked on “No, remove the files.” and then say OOPS! Well, I did plenty of times to discover this trick.
In short, you can find those removed files under Temp folder like many other windows application files. Usually, the location will be somewhere like this – C:UsersprathyAppDataLocalMicrosoftPowerBI DesktopTempSaves. This location depends upon which version of Power BI Desktop you have. Beware, these files will be removed whenever you clear your Temp Directory.
Auto-save and auto-recovery are marvelous things.