Does this imply that, having quit the app and closed all windows when I first created these multiple .scap files, I can never get Scapple itself to reload them into multiple tabs?
What will be loaded the next time you launch the software is dependent upon what you left open the last time you quit. If it only did that once, the first time you used the software, and never adjusted to how you work after that point for all time, then the setting would be quite useless, no? Maybe I don’t understand the question.
Oh, maybe what I’m missing is that you aren’t familiar with how to tab windows together after you close them individually? Try this tip, in that case.
I would have expected that feature to be part of Scapple, rather than reliant on how Mac OS is enabled
I would strongly disagree.