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Map frames as polygons in ArchGIS Pro
The end result
There’s a forum post here which describes the process, but I found this was a pretty nifty little trick that’s handy to know. You use the Create Fishnet tool to do it.
To start, you must have:
1. A 2D map with something on it
2. An existing layout with a map frame you are happy with
From there, basically follow the screenshot from the original post:
Personally, I set the geometry type to “Polygon” since you can use it as a mask or clipper more easily that way, and disabled labels. Either way works depending on what you are going for.
Best of luck!