I've been waiting for this plugin for so long! Thanks for that.
I immediately noticed the following problem: basically all accounts are listed in the dropdown. Even if accounts of a certain user group are not allowed to be displayed.
The plugin should definitely take into account the “visible” option in the user group options. Not sure what it's called in EN, I mean the checkbox at the top right on this page:
/wp-admin/admin.php?page=wpforo-usergroups&groupid=2&wpfaction=wpforo_usergroup_save_form
Only users who are included in a primary group, that is allowed to be viewed in search results / user list, may be listed by the dropdown.
Please add this fix (or option) quickly - otherwise I won't be able to use the plugin for data protection reasons.