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Hy @erdoslaszlo,
You can remove the enclosure by adding the following snippet to your theme’s functions.php or using a snippet plugin:
add_filter( 'gfexcel_renderer_csv_enclosure', '__return_null' );
However, please be careful with this; as any other comma’s that do end up in the output will be seen as delimiters; making for weird output.
To change the delimiter you can use the gfexcel_renderer_csv_delimiter-hook. To change it to a semi-colon for example, you would need the following code:
add_filter( 'gfexcel_renderer_csv_delimiter', function() { return ';'; } );
I hope this helps you out.
Kind regards,
Doeke