QB Issue Resolution:

The check layout isn’t editable. This was done to comply with Check-21 regulations, which prohibit any printing in certain areas of the check (its possible to set fonts to be large enough to print in those areas, which would make the check invalid).

Resolution for Issue 'How do you change the font style and size when writing a check in Quickbooks for MAC 2015' available: Yes (Solved).
Source: Intuit Community forum.

How do you change the font style and size when writing a check in Quickbooks for MAC 2015: 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 Checks
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Error Recovery for Checks [Canada]
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