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Report level slicer
Is it possible to use a slicer that will apply to all pages of a report?
This feature is added to the Power BI desktop February 2018 Update.
Feature List Power BI Desktop Update - February 2018 video
You can download Power BI Desktop from here.
Slicer is page scope object so you can't achieve that.
You can vote for the idea here to help push it along