Why can't I select INR for PayPal?

PayPal in Wcart supports USD, EUR, GBP, AUD, CAD and SGD. INR is not on its list, so PayPal is only offered at checkout for orders in one of those currencies.

For rupee orders, also enable a gateway that takes INR, such as Razorpay, Cashfree, PayUmoney, PhonePe or Stripe. Go to Settings → Store Settings → Payment Gateway, tick it in the Payment Gateways box, click Save gateways, then click Configure on its row and add your keys.

Customers then see PayPal for foreign currencies and your INR gateway for rupee orders.