Share Filtered Dashboard

Hello friends,

I would like to share my Expenses Dashboard with 2-3 Different Departments' Managers.

I's not a lot, so instead of playing with Row-Level-Sequrity, I thought creating 2-3 Dashboards (Pin Live Page from Reports)  that are filtered by a specific Department.

When I did this - I noticed that when they click it and go to the underlying report - they still see "Page Filters" and are able to choose another Department.

How can I set a filter that cannot be changed?

Is there a workaround without getting into Row-Level-Security?

Thank you,

Michael