The last version that uses Qt5 is Fritzing 0.9.10 . Fritzing 1.0.7 is four years after that… I don’t think it is worth trying a backport. Qt6 migration was one of the big parts of the Fritzing 1.0.0 release.
Oh, it looks like a confused 6.5.3 with 5.6.3. Sigh. I need to get an even newer version of Qt…
Well, I don’t have enough disk space to build QT 6. So I am going to have to give up on fritzing 1.0.7