Auto-Save in Mosaic v2?

When referencing help in Mosaic Designer v2.4.0, I noticed in Quick Start / V1.x.x to V2 Conversion / What's Changed, there is an interesting line in the General section:

"Auto-save – your work is stored to disk as you go"

I have been unable to find any more information on this.  Running a few tests, I see no evidence that Designer saves as you go. Does this feature exist, and if so, how do you enable it?

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