I think there are only 2 options now;
Start up initialized
Start up loading the last used GIG
Have you considered letting us define which GIG is loaded as a default when starting GP or when choosing the File / New option? This allows us to define our starting point.
As indicated before, you can hold down shift while loading GP to avoid this.
Shift when starting GP would avoid loading the alternate defined start up GIG
Shift when File/New would load the current raw initialized GIG that we’re familiar with