Hi abubk,
it turned out, that issues happened with LibreCAD-2.2.0-rc3.dmg on Big Sur. Presumably it is not related with M1 CPU.
Anyhow, I assume that your M1 Mac has Big Sur and thus you need LibreCAD-2.2.0-rc3-BigSur.dmg.
With automatic builds coming soon this should be solved and we can return back to one package for all MacOS in future.
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