Yes. To switch from a Monthly plan to a 6-Month or 12-Month plan, you’ll first need to cancel your current Monthly subscription.
After you cancel, you’ll continue to have access to Premium features until the end of your current paid subscription period. Once your Monthly subscription ends, you’ll be able to purchase a new Premium Subscription plan. Your new 6-Month or 12-Month plan will begin as soon as you purchase it.
Please note: If you subscribe through the Apple App Store or Google Play, you’ll need to manage subscription changes through your Apple ID or Google Play account.