Syncthing failing after restoring from backup

I had to restore my home from a backup and the username changed. When I run Syncthing now it complains that folders which are clearly there are missing. They are supposed to be at /home/olduser/foo but now are at /home/newuser/foo. However, I cannot seem to edit that path.

How should I fix this?

Its best to remove the folder and add it again.