Removing decimals from quantity field

First find out which invoice template you are using.
Open up an invoice and look at the template field:


Open up the invoice designer:


Select your template. Then to remove the decimals from the quantity field:
1) Click the quantity field
2) Click the little white arrow
3) Click the dots beside format string
4) Select Number and choose "#,#"

Please see the screenshot below:

Then click the save button at the top left:

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