I've got problems with the hide admin feature

Hi there
I’m trying this plugin for first time (I”m use to use wordfence) in my MU sites and I’m having a problem.

I’d like to use de hide login feateure because thank wordfence I’ve been alerted about the “thousands” of attacks my site has everyday but, wenhI click to “save changes”…. nothings happends.

The away feature wordks fine, the admin rename works fine, but the back ups dont work to me , other features I dont know and the most imporntant to me, hide admin donts work.

I’ve tried to deactivate wordfence and try again, but still not working.

Is a MU in directory method

https://www.example.com/misite1
https://www.example.com/misite2
https://www.example.com/misite3

and with domain mapping using the WordPress MU Domain Mapping

Thansk ??

https://www.ads-software.com/plugins/better-wp-security/