Was making new Autocross layout, placed over 2,000 items, saved layout, then opened other finished layout to re-use the start gantry I'd used in previous layout.

So, copied gantry from previous layout, but then, not paying enough attention, hit 'Save layout' instead of 'Load layout', and saved the (older) layout name I was on over the new layout name.

This left me with same layout under 2 different names.

First time I've ever done this in over dozen years of making autocross layouts, but still, no way to undo my stupidity.

An UNDO (and REDO?) option would have been a great help.