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There really are very few things different about 1.3 vs 1.4.x that I would expect to cause problems like you are experiencing. They all use the exact same build of Qt5.12.9 and Python 3.8.3, for instance.
And we know it's nothing inherent to either Sigil 1.4.3 (don't bother trying to install 1.4.0-2) or Windows 10. I compile and test Sigil on Win10 Pro (latest updates) and experience no such issues. As do countless others using the same formula.
Please verify the following:
1) You're opening Sigil as a standalone app and not via calibre's Open With (built-in feature or plugin)
2) the issue presented itself with every single epub you opened.
3) the issue presented itself when launching Sigil without an epub (the default empty epub you get when double-clicking the Sigil desktop icon).
Something you could try would be to back-up your Sigil preferences folder somewhere else, then delete it from its regular location and then install Sigil 1.4.3 and let it recreate the default preferences (just like a fresh install) when it's launched the first time.
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