One thing that seems to work requires setting the QT_QPA_PLATFORM environment variable to "windows:darkmode=0" (without the quotes). But doing so would force all Qt6 (6.5+) programs to run in light mode regardless if the system was set to dark. If you really wanted to just target Sigil, you'd need to create a batch/cmd file to set the variable before launching Sigil.
There is no converse option to force Sigil to run in dark mode when Window is running in dark mode.
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