Hi Mark,
Thank you for reaching out to us.
miniOrange Two Factor(2FA) free plugin supports 2FA for only one user(administrator) in the plugin.
Can you please check if the user who installed the plugin is protected with 2fa? And as other users should not be able to change the settings it is only visible to the user who has installed the plugin.
If you want to enable 2FA for more than one user you need to upgrade to the premium plan.
To upgrade to the premium plugin, please refer to the Upgrade Plans Tab in the plugin.
You can also click on the link to upgrade your plan to Premium: Upgrade to Premium, and for Standard: Upgrade to Standard.
Let us know if you need help with the upgrade.
Thank You,
Mittal