I’m going to uninstall Particle Dev, npm the lot and then reinstall. I can’t tell you if this feature worked when Particle Dev first updated to 1.7.3? when the new libs first came out as the only one I use I keep locally due to a pinout error. I shall look on my other machine later, both of them are Windows 10. I did just try something on the CLI and it seemed very broken.
The USE button works correctly now after starting a new empty project folder list.
It does not work if you have a project folder missing project.properties, it just keeps adding new projects.
EDIT: I also rebooted and started as administrator then used the default path for a new project.
EDIT2: The MPU6050 library still outdated and wont compile. https://github.com/pkourany/I2CDEV_MPU6050/issues/8
you can see hes fixed it and pushed it but the one in the manager is still old.
That’s because the lib in this repo is still in legacy format which is not compatible with the Library Manager.
I have opened an issue in the repo about that (ping @peekay123) .