You can preclose a loan whenever you want to. In order to do so, please follow these steps:
1️⃣ Tap 'Purchases'
2️⃣ Click on Loans to view your active loans
3️⃣ Select loan to view your purchase summary
4️⃣ Tap the drop-down arrow next to '1 month'
5️⃣ Select 'Preclose' and click 'Pay now'
And you'll be done. 🙂