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.

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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.

In video :

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Check this tutorial to know how to apply a filter on a report level !