'How to change automatically changed numeric value from date format to numeric in excel?

I have a problem with my 78 thousands row document in Excel [using Excel 2016]. When i got it, the numeric data was changed into date because it was decimal with a dot.

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Is it possible to changed that date format to number without changing the cells value? [like in picture from 2.1 changed into date format back to 2,1?]



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