disable "Lock remote computer"

Dear all,

I installed Teamviewer 12  on my PC and working as a normal user, I would like to disable the "lock remote computer" setting, but i´m not able - the setting is greyed out"

Login on the Pc as a Administrator is ok and I set to "never" but as a normal user the setting is still Automatic.

May it´s possbile to set this in the registry ?

Many thanks

Thomas