I only see some users in the Change Entry Creator dropdown
Some larger websites have a ton of users, so GravityView put a limit on the number of users displayed in the Change Entry Creator dropdown by default. This was to prevent the page from taking too long to load in cases where there are thousands of users.
The default number of users shown is 2,000. If you have more, install the plugin below.
Download and install this plugin to remove the user limit: gravityview-show-all-users.php.zip
Advanced filtering of users
If you would like to modify the users that are shown in the Change Entry Creator dropdown, use the
gravityview_change_entry_creator_user_parameters filter. It accepts all the arguments passed to the
get_users() function (see the Codex doc).