Opting into new tax regime

While filling ITR-1, why does the quicko portal ask me to fill form 10-IE to opt in for the new tax regimen?
As far as I am aware, this form is to be filled for business/professional income for ITR-3.
How should i proceed to opt in for the new tax regime for ITR-1?

2 posts were merged into an existing topic: New vs Old Regime