QB Issue Resolution:

Yes, QuickBooks has two decimal places by default and the option to change this is currently not available. I’d recommend letting our Product Development Team know about this. They’ll put your feedback into consideration for future updates. You can click the Gear icon in the upper-right corner and select Feedback.

Resolution for Issue 'The current default setting for decimal places is 2. I would like to increase it to 3 for our company. I am the Accounts Manager and would be glad if you could help me with this asap.' available: Yes (Solved).
Source: Intuit Community forum.

The current default setting for decimal places is 2. I would like to increase it to 3 for our company. I am the Accounts Manager and would be glad if you could help me with this asap.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Change amount of Decimal Places
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Error Recovery for Change amount of Decimal Places [Canada]
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