how to change Code Generation Strategy in VS2015?

I am using VS2015 and running into following error, dont see any such property as Code Generation Strategy in my property window as shown in screen shot,how can I find this propery?

// T4 code generation is enabled for model 'C:\Users\username\documents\visual studio 2015\Projects\EFdemo\EFdemo\EmployeeModel.edmx'. 
// To enable legacy code generation, change the value of the 'Code Generation Strategy' designer
// property to 'Legacy ObjectContext'. This property is available in the Properties Window when the model
// is open in the designer