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Hello MMK21! I'm Jen, an independent advisor and a fellow Microsoft user like you. I'd be happy to help you out with this issue.
Unfortunately, there's no option yet to set AutoFill default to the option you want.
Kindly check out the uservoice forum link mentioned below and see the reply of the Excel Team from Microsoft.
https://excel.uservoice.com/forums/304921-excel...
In the meantime, I can give you a quick work-around for this. Normally, when you select a single cell that contains a number, then drag the Fill Handle, the default behaviour is to copy. When the cell contains a date, or text with a number at the end of a portion of the text, the default is to fill the series.
To override either behaviour, press the Ctrl key as you drag the Fill Handle. Release the mouse button, then release Ctrl key. (Note: you can press the Ctrl button at any time during the AutoFill process, so if you start to drag, and the autofill isn't doing what you want, press the Ctrl key.)
I hope this information helps.
If you have any questions, please let me know and I'd be glad to assist you further.
Thank you and Best Regards!
Jen :)