Good day, jackduong1230.

By default, QuickBooks Online has two decimal points on every transaction. Though we can change its format, it'll still have the decimal points on it.

1. Go to the Gear icon and select Account and Settings.
2. Select the Advanced tab. Click the Edit (pencil) icon on the Other preferences section.
3. From the Number format drop-down, select the format you want.
4. Click Save and Done.

I'll be here if you need anything else. Have a great day!