Hello there, Stjosephproperty.
QuickBooks Online does not support direct manual entry for margin adjustments, such as a 2.5" left margin. Instead, alignment is handled by dragging the grid in the Print Setup.
Also, when adjusting the left margin (Horizontal) using the plus (+) and minus (-) buttons, only whole numbers can be selected.
As a workaround, you can try troubleshooting your print settings to align your checks to meet your specific needs.
Once your print settings are configured, you can then print your checks individually or in batches.
If you have further questions, don't hesitate to reach out. We're here to assist you.