In Excel, the Save As operation creates a new copy of the workbook with a new name and format / style, then closes the old one.
The .csv file does not support macros, so your book behaves the way it was designed.
To return to the original workbook after Save As , you will need to open the original workbook again and close the new .csv workbook.
Otherwise, you can create your own Export method to simply export the data on each sheet to a CSV file, but this seems unnecessarily complicated.
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