I think it would be very helpful when working in the Info panel of several Glyphs files at the same time, that there wouldn’t open a new Info panel for each Glyphs file, but that you can browse through all Glyphs files that are open at that moment in the same panel.
Makes it a lot easier to copy info from file to file.
Well in short: bunch of .otf files, no source files, reverse engineering, change a setting, export again. Just one of those situations where a typical new font project with setting up a neat design space with masters in the same Glyphs file does not apply.
What about collecting them, one by one, in a single .glyphs file? File > Font Info > Masters > plus menu in bottom left > Add Other Font even allows adding multiple fonts at once.
I’m trying that, but I’m getting style name conflicts. It doesn’t recognise UltraThin or ExtraBlack, so I have two Thin masters and two Black masters. Glyphs also changes naming from SemiBold to DemiBold.