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Hi LH Lonon,
I can understand how disruptive this can be, especially when you are making temporary formula changes and expect to be able to discard them.
The AI answer has already covered turning off the AutoSave switch and using a copy for what-if testing. One additional point worth checking is where the affected workbook is stored. AutoSave is normally used for files stored in OneDrive or SharePoint and can save changes every few seconds.
Could you check whether the workbook is stored locally on your computer or in OneDrive/SharePoint? Also, after opening the workbook, please check the AutoSave toggle in the upper-left corner of Excel and let me know whether it shows Off.
If the toggle remains Off but Excel still saves changes automatically as you edit, please let me know. That would help distinguish this from the normal AutoSave behavior and narrow down what is causing the workbook to be saved.
For now, I would also recommend making a backup copy of the affected workbook before further testing.
Official Microsoft reference: What is AutoSave?
Thank you so much for your understanding.
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