Hi Robert,
I believe you are using the grid search appstore component: https://appstore.home.mendix.com/link/app/49364/
Is that correct?
If so, i am not aware of a customizable default search filter in that widget.
You may want to ask Eric if he maybe would add the feature, but in community supported components the components are as-is without guarantees for support.
I hope this helps,
Michiel