Hi Sunitha ,
If set to Fixed, the decimal part always will be displayed with the number of places specified in the Decimal precision property. The value will be rounded to the nearest decimal if the length of the decimal part in the attribute value exceeds the number of decimal places.
If set to Auto, the whole decimal part of the attribute value will be displayed. No decimal part will be be displayed if the attribute value is an integer.
Default value: Fixed
Examples
You can also use a function to change it's precision
formatDecimal(1234.56, '#,###.#')
Hope it helps. Let me know if have more questions around this.
You can read this doc for more info on this,
https://docs.mendix.com/refguide7/parse-and-format-decimal-function-calls/
You could try using a display pattern in the token settings for decimals
#,###.##
Otherwise you could configure a helper entity in the email setup microflow to formatDecimal($Value, ‘#,###.##’)
Read on here for more detail on formatting decimals
Parse and Format Decimal Functions