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1 hour ago, Pšenda said:

but it doesnt say how to achieve this.

i stand corrected!

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in Photoshop I can go to Window/Arrange/New window for current document...

So I can have a small preview version of my painting on the 2nd monitor.
Is there a way to do the same in Affintiy Photo?

I found this: https://affinityspotlight.com/article/increase-your-efficiency-with-affinitys-separated-mode/

"An example three-display arrangement, as defined in System Preferences’ Displays pane (bottom left), showing two different document views on separate displays, and toolbars and panels on a third display."

but it doesnt say how to achieve this.