Ok, I think I found the cause of the problem, and that's odd ! I have two monitors, and I launch calibre from a shortcut icon which is on my left desktop, whereas calibre window is on my right desktop... when i move the shortcut icon on my right desktop and launch calibre from there, the calibre window shape is correct !
I suppose it is a Windows 10 issue dealing with the 2 screens display...! Good to know !
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