If Builtin admin is logged in the Firewall and another local user member of SonicWall Administrators group logged into the system, it won't see the option to preempt the builtin admin account. When the local user member of SonicWall administrators group logged into the Firewall, and after successful authentication a pop up message is displayed and clicking the manage button display the following pop up with only "Non-config" login to the Firewall and also displays the information that an administrator is already logged into the Firewall, see screenshot below:
If multiple administrators are required to manage the Firewall and preempt each other then create two local users (admin1 and admin2 created for demonstration) and add them to SonicWall Administrators group, see screenshots below wherein one admin1 member of SonicWall Administrators already logged in to the Firewall and then admin2 member of SonicWall Administrators logged in from another interface and presented with preempt option.
admin1 already logged in with Config mode as shown in the screenshot below:
admin2 logged in from another location and presented with "Continue" option to preempt admin1, see screenshot below:
admin1 and admin2 are now showing as logged in and admin2 showing as Config mode, see screenshot below: