Is there a shortcut for this?

Hello.
Is there a shortcut to switch between these windows?
https://s3.amazonaws.com/zotero.org/images/forums/u6029627/qyolpzo0ditcyf7286ok.png

I'm reading on the window in the right (the pdf), and I want to register notes quickly. Can you help me?
Thank you, and continue this amazing work!
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