Assigned Author – beyond the first 100 users?

Glad to help.

Yes you are correct the Assigned Author setting shows a limited number (200) of options/users for sanity’s sake. The plugin does provide a filter however, that enables you to change the number of users included in the Assigned Author setting, it looks like this:

$user_max = apply_filters('usp_max_users', 200);

But tbh I’m not sure how many select menu options can be displayed (like 10,300 or whatever you need); it would depend on server, browser, and other factors. But the filter is there if needed.

I hope this helps, let me know if I can provide any further information.