All the sales transactions like Sales Order, Sales Invoice have Rounded Total in it. It is calculated based on the value of Grand Total. Moreover, Rounded Total is also visible in the Standard Print Formats.
However, if you wish to disable the same, you may follow the steps given below to hide the rounded total from Standard Print Formats, for all the sales transactions.
From the Awesome Bar search for Global Defaults
Check Disable Rounded Total, and click on save.