I don't think I can do that either. I don't use Sigil so I can't test with it.
I think Calibre might be switching to a default window size and then back to the last-used window size. But the default is small, and I have to use Calibre in a larger size, on the bigger screen, to work with tags, to see formats, etc., and extra columns to see the tags at a glance.
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