I am running IDE 1.8.9 on Windows 10. I would like to build a new stand-alone installation of a newer IDE version so downloaded the .zip file for IDE 2.0.0-beta.9. I extracted the files to a new folder per the instructions for building a portable version. The folder structure under 2.0.0 is completely different from 1.8.9 so I'm not sure where to put the new portable folder. I put portable in the /arduino-ide_2.0.0-beta.9_Windows_64bit folder but when I start 2.0.0 from Arduino IDE.exe it is still using all of my old files, such as boards from C:\Users\me\AppData\Local\Arduino15. I can't see any evidence that 2.0.0 is running in portable mode. How do I configure 2.0.0 for portable mode?