How to reset game progress / disable sync cloud save?

Unfortunately my game progress seems to be broken so I want to start from scratch. But every time I reinstalled and start game, The game will start sync to cloud save and completed in a moment (too fast to cancel it).
How to disable sync to cloud or reset game progress?

EDIT: This solution seems to not work. I can’t select local save.
https://forums.flightsimulator.com/t/corrupted-cloud-save/340889/4

I would like to know the answer to this too. My cloud data has issues and I would like to start clean.