You mean the old tabs? There's a checkbox to show them. (scroll up a couple of posts) Then you can work through them manually and delete everything.
The macros should always show, if they're still there. If not, I'd call that a bug, but a workaround might be to:
- Back up what you want to keep, probably manually, as the Export/Import buttons cover everything
- Uninstall the plugin
- Start and close OBS, so that it doesn't load the (uninstalled) plugin and then overwrites the file without it
- Reinstall the plugin
- Put your settings back in it
To (somewhat) answer your question, it's part of the Scene Collection. (so you'll have to expand steps 1, 3, and 5 if you have multiple) Where that is in the file system, I don't know.