The number format option is available in all QBO versions, kalghanim.
You'll see this option even if the home currency is not USD. However, if your access to the company file is limited or view-only, you won't be able to change the number format.
Please know that QuickBooks Online does not have an option to change the decimal format to three digits. When you edit the number format, the changes will only take effect on how the numbers are displayed on the reports.
If you have additional questions, just let me know.