Tutorial on creating a zoom area in a circle

Recently there was a tutorial on how to click on an question mark icon and the a zoomed area near the icon would appear in a circle. It was done with layers. The title on the slide was Scivener Overview. I think it was a Mike Enders' tutorial.

How can I find this tutorial? I don't have it bookmarked and would like to use this cool technique.

Thank you,


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