The One At A Time plugin only allows one administrator to log into your site. Simple, lightweight, and functionality oriented. No additional settings required.
How to use it:
1. Download & upload the One At A Time plugin to your site or install the plugin directly from the admin panel.
2. Activate the plugin.
3. That’s it.
I hope you found One At A Time plugin helpful.
Allow only one administrator at a time to manage your WordPress site
Don’t bury your thoughts, put your vision into reality ~ Bob Marley