As default the filters have effect on every page.
You can simulate unlinking filters by:
- This sheet navigation extension has Clear selection option at sheet navigation Qlik Branch
- Or create different tables to different sheets. The filters will be stay at selections pane, but haven't got effect on data.
Or if you want to maintain different selections on each sheet, you might have to use Alternate State extension
But this will be a bit painful to maintain all objects to assign to the correct State.
it also depends on what you want to do exactly. You can add the same field in script to multiple field names. For ex:
Country as Country,
Country as Country1,
So sheet1 use Country filter, sheet2 use Country1 filter and then in your expresion, you might need to exclude Country or Country1 selections. Again, this will add extra works for you.
Or the Clear selection at sheet navigation option mentioned above.
This is just different suggestions, depends on your scenario, you can decide what to do.