By default, IRN for e-invoices appears in documents like this:
But if you want to show this in a single line as shown below, you can do that as well!


To enable this, just go to
Business Settings > Accounting Option > GST Configuration > Choose IRN location on your documents > Select “Above Line Items”:


Although this is recommended, you can always change its location back from settings if you prefer.
Additional Resources:
How to Generate E-invoices through Refrens? (India)
How to generate E-invoices for SEZ and Export? (India)
How to pass payment details to E-invoices? (India)
How to generate E-invoices for Credit and Debit Notes? (India)
How to Create GSP User Name and Password to Generate E-Invoices on Refrens? (India)
How to view e-invoice acknowledgment no. & date? (India)
How to enable signed QR codes in IRN generated documents? (India)
How to fetch & update E-invoice status of the invoices generated/canceled outside of Refrens? (India)