Filter in control visualization

Hello,
I want to filter a field in a control visualization but I have tried to insert a filter in the header filter but
it doesn´t work. Is it possible? I mean, apply any filter on Control.

Another option for me would be to have a filter inmutable on a parent control, so the final user can´t delete this filter. Are there any alternative?

Thank you.

Select the field you want to add as a new page-level filter, and drag it into the Page level filters area!