Microsoft PowerToys' Crop and Lock lets you make mini app windows - The Verge

TL;DR

Crop and Lock, available for both Windows 11 and Windows 10 v2004 (19041) or newer, has two modes — a non-interactive Thumbnail crop that’s essentially a live feed of the area you select that updates with the page, and a “Reparent” mode that Microsoft writes is more interactive, but could have compatibility issues with some apps. Microsoft lists a few known issues:Cropping maximized or full-screen windows in “Reparent” mode might not work. Notepad and OneNote are notable examples of applications that react poorly

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