If you need more informations, you can follow the tutorial. You can also find a template for at the end of the page.
The tutorial
How to apply filters on every component in a report page in Looker Studio ?
First create your filter :
Go to Resource -> Manage Filter -> Click on Add Filter and configure one.
Then apply it to the entire page :
Go to Page -> Current Page Settings
On the Filter section, click Add Filter and select the one you just created.
Bonus : You can prevent a page-level filter to apply on a specific component by checking the Inherit filter option in the filter configuration for a component.
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