If possible share your sample workbook,
or screen shots to understand your query.
For an example, you are filtering on [Region] field in two different reports, Once you select the value from Quick filter, it will reflect in both reports.
If you want to make separate ,
then create a copy of Region field then use [Region] in 1st report and [Region Copy] use in 2nd report. Then add the Quick filter on both reports.
Now you can handle the Quick filter separately for both reports.
Tried duplicating the dimension, but that didn't work. Is there another way to copy?
Start the buiding the report from scratch or change the apply the filter to specified sheets. (Global filter).
Once you follow the steps as shared in previous thread to handle the Quick filter sepearately for two views,
Go to Dashboard, then select the View, then click on "Analyis" on menu bar then select "Filters".
Repeat for 2nd report as well.
Got it, thank you!