Hello candidate,

The JEE mains paper 1 examination is held for the students who are wishing to get admission into Bachelors of architecture courses provided in most of the NITs and various other government colleges through the josaa counselling process, and the paper 2 JEE mains examination is held to get admission into Bachelors of Technology courses at various colleges.

So, it's not mandatory for a candidate to appear in both of the papers if he is just wishing for architecture stream itself. For more details you can visit https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-frequently-asked-questions-faqs/amp

If you have any further queries feel free to post it here!!