Hi, did anyone notice such bug with Adobe Acrobat 2020? When I want to compare 2 PDF files in Acrobat, I use Window-Tile-Vertically to position them in parallel. However, once with Acrobat in the Groupy, one PDF file will disappear. (not shown on the screen.) I can see it in the tab of toolbar, which shows there are 2 files opened,
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