In Sigil's Preferences, you can set font and font size and line height will adjust automatically.
Some OS system Accessibility setting are available as well as a Sigil's Zoom setting.
The margins are controlled by Sigil so that line numbers can be displayed.
What exactly are you trying to accomplish with CV's appearance and why?
And yes the qt_styles.qss can be used to impact CV's QPlainTextEdit.
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