Here at NICO, we have Factory Service Manuals available free to members. I regret to say however, that in 2017 Nissan changed their Service Manuals from PDF to HTML format. A few years after that, they stopped selling the FSM manuals on CD (IIRC the CD's were being sold for $300 USD).
The only way to view a FSM for vehicles beyond the 2016's is to rent access from Nissan:
https://www.nissan-techinfo.com/deptsubs.aspx
1. One Year Subscription $900.00
2. 90 day Subscription $300.00
3. 30 day Subscription $90.00
4. One day Subscription $25.00