No longer syncing group -- how do I remove the synced items and attachments on my local system
I did see some other questions on the forum that seemed the same or similar, but I could not distill from them what I had to do to remove the items that were previously synced to my system. I have disabled sync for these groups in the prefs, but the items and attachments remain.
There's not currently an easy way to do this. If you disable syncing, it just disables syncing (and only when for auto-sync and the sync button — you can still right-click and sync the groups manually). There's no way to remove a group that's already synced without leaving the group.
So one option would be to set your library sync settings as you want them, make sure you're fully in sync, close Zotero, delete zotero.sqlite and 'storage', and then sync down the checked libraries to the empty database.
We can think about offering a way to remove just the local copy of a group.