QB Issue Resolution:

For the reports there is a font icon in the toolbar. You can change all the report fonts globally to be larger.

For the registers the font size is fixed. The only alternative is to set the screen resolution to be lower in the Apple display pref panel.

Resolution for Issue 'Change Font Size' available: Yes (Solved).
Source: Intuit Community forum.

Change Font Size: 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 Font Size
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Error Recovery for Change Font Size [Canada]
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