How to start again on a Mac (complete uninstall)

OK, I have failed miserably to share our company folder. I get 23,000 errors, including thens of thousands along the lines of:

yyy/xxx/DSC00816.JPG peers who had this file went away, or the file has changed while syncing. will retry later

I suspect ticking “introducer” was this mistake. May of the files in error belong to devices which no longer exist.

As another attempt, I want to wipe everything, and start again, this time with only a single user and no introducer, to see if this will sync.

Any idea how to do this? I know that syncthing puts stuff in various places int he home dir, not just in the dir you downloaded the executables.

I saw a post saying it put it in tild/.config/synchting, but its not there (nor .syncthing)

I also get frequent syncthing crashes (have to kill the terminal and re-launch), and 0% synced