Windows 10 – OneDrive
Right click on the app and one of the properties has an option to not automatically start it. Uncheck, restart the computer, and it should stop. If you want to go another step further, find the OneDrive app in the start menu, right click on it and uninstall.
If that is still insufficient, there is a batch uninstaller for OneDrive available online. I can copy the code here if you need it.