
Hello @Gideon Abrams ,
Welcome to Q&A Forum!
AutoSave is a new feature available in Excel, Word, and PowerPoint for Microsoft 365 subscribers that saves your file automatically, every few seconds, as you work.
AutoSave is enabled by default in Microsoft 365 when a file is stored on OneDrive, OneDrive for Business, or SharePoint Online.
From my research, you cannot disable AutoSave feature for web/browser clients, turning off AutoSave feature is only available for desktop applications.
Reference:
Thanks,
Echo Du
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