Doesn’t always seem to do it. I’ll try and figure out what sequence of events causes it. I have a file open, exit sql nav, come back in and it’s in two tabs. Not sure you can even do that if you try from the UI!
Try this: Open nav when it will open a file for you (in one tab).
Run a select from that tab.
Then, open a new tab, type in a select.
Exit have, clearing the “save on exit” so that it won’t save either change.
Come back into Nav.
It should have the file open in both tabs now.
One other thing of note, if you add a new tab and put a select statement in it, then try to close Nav, you’ll get the “Save on exit” dialog as expected. If you pick OK, then cancel, it will exit Nav. My expectation would be that canceling would cancel my exit, but it doesn’t.