Well hopefully someone answers you. I don’t know how to remove 3rd party plugins, because I’ve still never tried installing any.
But you can find your Obsidian preferences here. Maybe you can find a clear folder for the Note Refactor plugin in here:
~/Library/Application Support/obsidian/
Also this may be relevant. In Obsidian 0.10.3 the way keyboard shortcuts work was changed.
Hotkeys have been completely revamped to always use keyboard layout independent mode.
What version of Obsidian are you currently using?