Microsoft's new control panel is designed for brain damaged gorillas as best as I can tell. Instead, locate a PDF file, right click on it, choose "Open with" then click more apps, you should see calibre (at least I do on my w10 PC) if you do not, then scroll to the bottom of the list and click on "Look for another app on this PC" browse to the calibre installation folder (C:\Program Files\Calibre2 by default) and choose calibre.exe
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