Prevent control panel from automatically grouping with file explorer

Does anyone know a way to stop control panel from opening up in a group with open file explorer windows -- if they're already open, and 'automatically group windows of the same application' is turned on?  

I even put c:\windows\system32\control.exe  in the exclusion list and it still opens up in the group with my explorer windows, which is explorer.exe -- how does that make sense??!!

I'd like to find a solution to this, since I like my file explorer windows opening in the group automatically, but I hate control panel opening up in them - I keep my file explorer in a little window in the bottom right corner and it's totally not the right size for viewing the control panel

Thanks

Avery