QB Issue Resolution:

no you can not, the field size is set by the programmers

and font size is not customizable per field

Resolution for Issue 'Can I enlarge the billing address space or make the font smaller? The names and/or addresses wrap to an additional line and it does not look professional.' available: Yes (Solved).
Source: Intuit Community forum.

Can I enlarge the billing address space or make the font smaller? The names and/or addresses wrap to an additional line and it does not look professional.: 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 enlarge the billing address space or make the font smaller
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Error Recovery for enlarge the billing address space or make the font smaller [Canada]
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