Preview Window
Thank you for your answer but there is something else going on. The font adjustment provided by the F5 key appears to change the font for both the Book View/Code View and the Preview windows simultaneously. The font is still on the default setting of 16 pt which provides about 20 lines of text in the Book View window, but 120 lines or more in the Preview window.
Your answer gave me the idea of changing the font to the maximum of 99 pt. to see what would happen. The Book View/Code View window then only had room for about 1 character (as one might expect) and the text in the Preview Window became just barely large enough to read.
Note that I have downloaded and installed both the latest version of Sigil and the latest NVidia graphics driver today, but this bizarre problem remains.
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